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Vasiljevic M, Selakovic D, Rosic G, Stevanovic M, Milanovic J, Arnaut A, Milanovic P. Anatomical Factors of the Anterior and Posterior Maxilla Affecting Immediate Implant Placement Based on Cone Beam Computed Tomography Analysis: A Narrative Review. Diagnostics (Basel) 2024; 14:1697. [PMID: 39125573 PMCID: PMC11311595 DOI: 10.3390/diagnostics14151697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2024] [Revised: 08/01/2024] [Accepted: 08/03/2024] [Indexed: 08/12/2024] Open
Abstract
BACKGROUND The aim of this narrative review was to provide insights into the influence of the morphological characteristics of the anatomical structures of the upper jaw based on cone beam computed tomography (CBCT) analysis on the immediate implant placement in this region. MATERIAL AND METHODS To conduct this research, we used many electronic databases, and the resulting papers were chosen and analyzed. From the clinical point of view, the region of the anterior maxilla is specific and can be difficult for immediate implant placement. FINDINGS Anatomical structures in the anterior maxilla, such as the nasopalatine canal and accessory canals, may limit and influence the implant therapy outcome. In addition to the aforementioned region, immediate implant placement in the posterior maxilla may be challenging for clinicians, especially in prosthetic-driven immediate implant placement procedures. Data presented within the recently published materials summarize the investigations performed in order to achieve more reliable indicators that may make more accurate decisions for clinicians. CONCLUSION The possibility for immediate implant placement may be affected by the NPC shape in the anterior maxilla, while the presence of ACs may increase the incidence of immediate implant placement complications. The variations in IRS characteristics may be considered important criteria for choosing the implant properties required for successful immediate implant placement.
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Affiliation(s)
- Milica Vasiljevic
- Department of Dentistry, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Dragica Selakovic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Gvozden Rosic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Momir Stevanovic
- Department of Dentistry, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Jovana Milanovic
- Department of Dentistry, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Aleksandra Arnaut
- Department of Dentistry, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Pavle Milanovic
- Department of Dentistry, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
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Munhoz EA, Xavier CRG, Salles RP, Capelozza ALA, Bodanezi AV. Convenient model of hard tissue simulation for dental radiographic research and instruction. World J Methodol 2024; 14:88850. [PMID: 38577207 PMCID: PMC10989409 DOI: 10.5662/wjm.v14.i1.88850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/20/2023] [Accepted: 01/19/2024] [Indexed: 03/07/2024] Open
Abstract
BACKGROUND The authors describe a technique for building an alternative jawbone phantom using dental gypsum and rice for research and dental radiology instruction. AIM To investigate the potential of an alternative phantom to simulate the trabecular bone aspect of the human maxilla in periapical radiographs. METHODS Half-maxillary phantoms built from gypsum-ground rice were exposed to X-rays, and the resulting images (experimental group) were compared to standardized radiographic images produced from dry human maxillary bone (control group) (n = 7). The images were blindly assessed according to strict criteria by three examiners for the usual trabecular aspects of the surrounding bone, and significant differences between groups and in assessment reliability were compared using Fisher's exact and kappa tests (α = 0.05). RESULTS The differences in the trabecular aspects between groups were not statistically significant. In addition, interobserver agreement among observers was 0.43 and 0.51 for the control and experimental groups, respectively, whereas intraobserver agreement was 0.71 and 0.73, respectively. CONCLUSION The tested phantom seemed to demonstrate potential for trabecular bone image simulation on maxillary periapical radiographs.
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Affiliation(s)
- Etiene Andrade Munhoz
- Department of Dentistry, Health Science Centre, Federal University of Santa Catarina, Florianopolis 88040-379, Brazil
| | - Claudio Roberto Gaiao Xavier
- Department of Stomatology, Radiology and Oral Surgery, School of Dentistry, University of São Paulo, Bauru 17012-901, Brazil
| | - Roberto Ponce Salles
- Department of Stomatology, Radiology and Oral Surgery, School of Dentistry, University of São Paulo, Bauru 17012-901, Brazil
| | - Ana Lúcia Alvares Capelozza
- Department of Stomatology, Radiology and Oral Surgery, School of Dentistry, University of São Paulo, Bauru 17012-901, Brazil
| | - Augusto Vanni Bodanezi
- Department of Dentistry, Health Science Centre, Federal University of Santa Catarina, Florianopolis 88040-379, Brazil
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Abdelhafez RS, Mustafa NM. Determining the periodontal phenotype-Probe transparency versus actual: A diagnostic study. J ESTHET RESTOR DENT 2023; 35:1001-1007. [PMID: 36891868 DOI: 10.1111/jerd.13032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 03/10/2023]
Abstract
AIMS Assessment of the validity of the transparency of the periodontal probe as a tool for determining the periodontal phenotype. MATERIALS AND METHODS The periodontal phenotype was assessed at the six upper anterior teeth of 75 subjects using two methods. One is through assessing the transparency of the periodontal probe upon insertion into the gingival sulcus. The second method was through the assessment and clustering of the width of keratinized gingiva clinically and the gingival and buccal plate thickness on Cone Beam Computed Tomography scan. RESULTS The probe transparency approach correctly identified thick periodontal phenotype in most cases (41 out of 43 [95%]). However, this was not the case for thin periodontal phenotype; probe transparency approach identified 64% of the thin sites (261 out of 407) and misclassified nearly one third of the patients. CONCLUSION The probe transparency approach is a valid approach in identifying the phenotype in subjects with thick phenotype but not in subjects with thin phenotype. CLINICAL SIGNIFICANCE The definition of periodontal phenotype has recently changed. Accurate designation has been shown to affect treatment outcomes especially esthetic ones in different disciplines of dentistry. Probe transparency is commonly used by clinicians and researchers. Assessment of the validity of this method based on the most recent definition and compared to actual assessment of bone and gingival thickness is of great clinical value.
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Affiliation(s)
- Reem Sami Abdelhafez
- Department of Preventive Dentistry, Jordan University of Science and Technology, Irbid, Jordan
| | - Noor Mohammad Mustafa
- Department of Preventive Dentistry, Jordan University of Science and Technology, Irbid, Jordan
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Xu Y, Sun J, Xu Y, Yu Y. Introduction of Accurate Measurement of the Alveolar Bone Height in Bone Grafting Area after Sinus Lift. Curr Med Imaging 2022; 18:1384-1389. [PMID: 35726405 DOI: 10.2174/1573405618666220620172912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 05/02/2022] [Accepted: 05/08/2022] [Indexed: 01/25/2023]
Abstract
BACKGROUND Sinus lift via the alveolar crest approach has been proven to solve inadequate alveolar bone height perfectly in the posterior region of the maxilla. Nevertheless, the surgical area cannot be directly observed, imaging methods are necessary to reveal whether the surgery has achieved the expected results. Cone-Beam Computed Tomography (CBCT) images are usually taken before surgery and at the completion of final pre-repair osseointegration and evaluate the effect of maxillary sinus lift by measuring the alveolar bone height in the bone graft area. However, there is no uniform and recognized method to accurately measure the alveolar bone height in the bone grafting area before and after maxillary sinus lift. Therefore, the authors propose a simple, accurate, and reproducible method for the measurement of alveolar bone height in maxillary sinus lift on CBCT, which will be an innovation. METHODS 30 implant cases (30 patients) were included in this study. The authors create a uniformed measurement surface in the CBCT axial interface to ensure consistency at the completion of final prerepair osseointegration and before surgery. Then changes in alveolar bone height in the bone grafting area before and after sinus lift were measured on CBCT coronal and arch planes. Finally, for the purpose of verification of repeatability, three dentists from our department were randomly selected to measure and record the above CBCT data at three different time points. RESULTS The data showed that in the CBCT measurements of the three dentists, neither the coronal plane nor the arch plane was statistically significant. (P > 0.05). CONCLUSION This measurement method is simple, accurate and repeatable. It can be applied to measure alveolar bone height in the bone grafting area before and after maxillary sinus lift.
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Affiliation(s)
- Yan Xu
- Shenzhen Luohu People's Hospital (The Third Affiliated Hospital of Shenzhen University), Shenzhen, China
| | - Jin Sun
- Southern Medical University, Affiliated Shenzhen Maternity & Child Healthcare Hospital, Stomatology Health Care Center, Shenzhen, China
| | - Yao Xu
- Shenzhen Luohu People's Hospital (The Third Affiliated Hospital of Shenzhen University), Shenzhen, China
| | - Yuehai Yu
- Shenzhen Luohu People's Hospital (The Third Affiliated Hospital of Shenzhen University), Shenzhen, China
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Tayman MA, Kamburoğlu K, Öztürk E, Küçük Ö. The accuracy of periapical radiography and cone beam computed tomography in measuring periodontal ligament space: Ex vivo comparative micro-CT study. AUST ENDOD J 2020; 46:365-373. [PMID: 32656995 DOI: 10.1111/aej.12416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 06/11/2020] [Accepted: 06/17/2020] [Indexed: 11/27/2022]
Abstract
Our aim was to measure PDL space width using periapical radiography, CBCT and micro-CT. Dry human mandibular bones (n = 36) consisting of 59 molar and 36 premolar teeth were used. Four image sets were obtained as follows: (i) photostimulable phosphor plate (PSP), periapical radiography, (ii) CBCT 0.075 mm voxel size, (iii) CBCT 0.2 mm voxel size and (iv) micro-CT 0.06 mm voxel size. Micro-CT images were considered as the gold standard. Four observers measured the PDL space widths twice. Intra- and interclass correlation coefficients (ICC) were calculated. Spearman's rho correlation was assessed. PDL space widths ranged between 0.16 and 0.28 mm. There was good reliability within and between observers (P < 0.01). There was no significant relationship between micro-CT and periapical imaging. (P > 0.05). Best observer performance was obtained from CBCT 0.075 mm voxel size images followed by CBCT 0.2 mm voxel size images.
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Affiliation(s)
- M Ayşe Tayman
- Department of Periodontology, Faculty of Dentistry, Ankara Yıldırım Beyazıt University, Ankara, Turkey
| | - Kıvanç Kamburoğlu
- Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey
| | - Ebru Öztürk
- Department of Biostatistics, School of Medicine, Hacettepe University, Ankara, Turkey
| | - Özlem Küçük
- Department of Nuclear Medicine, Faculty of Medicine, Ankara University, Ankara, Turkey
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Assiri H, Dawasaz AA, Alahmari A, Asiri Z. Cone beam computed tomography (CBCT) in periodontal diseases: a Systematic review based on the efficacy model. BMC Oral Health 2020; 20:191. [PMID: 32641102 PMCID: PMC7341656 DOI: 10.1186/s12903-020-01106-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 04/05/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Periodontal diseases are prevalent among adult populations. Its diagnosis depends mainly on clinical findings supported by radiographic examinations. In previous decades, cone beam computed tomography has been introduced to the dental field. The aim of this study was to address the diagnostic efficacy of cone-beam computed tomographic (CBCT) imaging in periodontics based on a systematic search and analysis of the literature using the hierarchical efficacy model. METHODS A systematic search of electronic databases such as PubMed, Scopus, Web of Science, and Cochrane was conducted in February 2019 to identify studies addressing the efficacy of CBCT imaging in Periodontics. The identified studies were subjected to pre-identified inclusion criteria followed by an analysis using a hierarchical model of efficacy (model) designed for an appraisal of the literature on diagnostic imaging modality. Four examiners performed the eligibility and quality assessment of relevant studies and consensus was reached in cases where disagreement occurred. RESULTS The search resulted in 64 studies. Of these, 34 publications were allocated to the relevant level of efficacy and quality assessments wherever applicable. The overall diagnostic accuracy of the included studies showed a low or moderate risk of bias and applicability concerns in the use of CBCT. In addition, CBCT is accurate in identifying periodontal defects when compared to other modalities. The studies on the level of patient outcomes agreed that CBCT is a reliable tool for the assessment of outcomes after the treatment of periodontal defects. CONCLUSION CBCT was found to be beneficial and accurate in cases of infra-bony defects and furcation involvements.
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Affiliation(s)
- Hassan Assiri
- Department of Oral Biology and Diagnostic Science, King Khalid University, College of Dentistry, Abha, Saudi Arabia
| | - Ali Azhar Dawasaz
- Department of Oral Biology and Diagnostic Science, King Khalid University, College of Dentistry, Abha, Saudi Arabia
| | - Ahmad Alahmari
- Department of Periodontology, King Khalid University, College of Dentistry, Abha, Saudi Arabia
| | - Zuhair Asiri
- College of Dentistry, King Khalid University, Abha, Saudi Arabia
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Rédua RB, Carvalho FDAR, Artese FRG. Measurement of the bone height of mandibular incisors and canines on computed tomography-Limitations according to bone thickness. Orthod Craniofac Res 2019; 23:59-65. [PMID: 31478327 DOI: 10.1111/ocr.12343] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 08/27/2019] [Accepted: 08/28/2019] [Indexed: 12/01/2022]
Abstract
AIM To verify the correlation between cone beam CT (CBCT) and spiral CT (SCT) images and direct measurement of the bone height and to verify whether bone thickness (BT) influences the accuracy of bone height measurement on CT. SETTING AND SAMPLE One hundred and fourteen measurements were obtained in 10 dry human mandibles. MATERIALS AND METHODS The alveolar bone height was measured on volumetric and linear images. RESULTS Negative, average and significant correlations (-0.622** to -0.489**) were verified between BT and the absolute error. When the alveolar bone thickness was at least 0.6 mm, the mean differences were 0.16 and 0.28 mm on linear images and 0.12 and 0.03 mm on volumetric images for CBCT and SCT. Additionally, these values ranged from -0.46 to 0.79 and -0.32 to 0.88 mm on linear images and from -0.64 to 0.67 and -0.57 to 0.62 mm on volumetric images for CBCT and SCT. When the alveolar bone thickness was less than 0.6 mm, the CT evaluation varied from -1.74 to 5.42 and -1.64 to 5.42 mm on linear images and from -3.70 to 4.28 mm and -3.49 to 4.25 mm on volumetric images for CBCT and SCT. CONCLUSIONS Spiral CT and CBCT images demonstrate significant correlation with direct measurement for the alveolar bone height. Measurement of the alveolar bone labial and lingual to the mandibular incisors and canines presented higher accuracy when its thickness was greater than 0.6 mm. When the thickness was less than 0.6 mm, bone dehiscence can be diagnosed despite bone being clinically present.
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Kulah K, Gulsahi A, Kamburoğlu K, Geneci F, Ocak M, Celik HH, Ozen T. Evaluation of maxillary trabecular microstructure as an indicator of implant stability by using 2 cone beam computed tomography systems and micro-computed tomography. Oral Surg Oral Med Oral Pathol Oral Radiol 2019; 127:247-256. [PMID: 30595501 DOI: 10.1016/j.oooo.2018.11.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 08/15/2018] [Accepted: 11/21/2018] [Indexed: 11/30/2022]
Abstract
OBJECTIVE The aim of this study was to assess the trabecular microarchitecture of the maxilla by using cone beam computed tomography (CBCT) and micro-computed tomography (micro-CT) ex vivo. STUDY DESIGN Seventeen maxillary cadaver specimens were scanned by using micro-CT and CBCT devices. Samples were scanned with 2 CBCT devices at different voxel sizes (0.08, 0.125, and 0.160 mm for 3-D Accuitomo 170; 0.75 and 0.200 mm for Planmeca Promax 3-D Max). Morphometric parameters, such as bone volume/total volume (BV/TV) ratio, trabecular thickness (Tb.Th), trabecular separation (Tb.Sp), trabecular number (Tb.N), and degree of anisotropy (DA) were assessed by using CTAnalyzer software. Bland-Altman limits of agreement and intraclass correlation coefficient (ICC) were performed to evaluate agreement between CBCT and micro-CT in consideration of measured morphometric parameters. Statistical significance was set at P < .05. RESULTS The BV/TV, Tb.Th, Tb.Sp, and DA values were higher for CBCT images compared with micro-CT images, whereas the Tb.N value was lower with CBCT images than with micro-CT images. The BV/TV and DA parameters showed the highest agreement between CBCT and micro-CT devices (ICC = 0.421 for BV/TV and ICC = 0.439 for DA; P < .01). CONCLUSIONS The BV/TV and DA parameters measured on CBCT obtained at the smallest voxel size were found to be useful for the assessment of maxillary trabecular microstructure.
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Affiliation(s)
- Kıvanc Kulah
- Department of Dentomaxillofacial Radiology, Antalya Dental Health Center, Antalya, Turkey
| | - Ayse Gulsahi
- Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Baskent University, Ankara, Turkey
| | - Kıvanç Kamburoğlu
- Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey.
| | - Ferhat Geneci
- Department of Anatomy, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Mert Ocak
- Department of Anatomy, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - H Hamdi Celik
- Department of Anatomy, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Tuncer Ozen
- Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Gulhane Health Sciences University, Ankara, Turkey
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Fontão FNGK, Luiz J, de Freitas RM, Padovan LEM, Thomé G, Faot F. Real Versus Virtual Position of Single Implants Installed in Premaxilla via Guided Surgery: A Proof of Concept Analyzing Positional Deviations. J ORAL IMPLANTOL 2018; 44:463-469. [PMID: 30011244 DOI: 10.1563/aaid-joi-d-17-00288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of this research letter was to report the results of a pilot study designed to compare the real and virtual position of implants placed using computer-guided flapless implant surgery for single restorations in the premaxilla. A total of 8 patients (2 men and 6 women) with a mean age of 40 years old (range: 32-73 years) had a total of 11 implants inserted using a tooth-supported stereolithographic guide. After implant placement, the positions (coronal, central, and apical) and angulation of the implants installed in relation to those planned were determined via the superposition of pre- and postoperative 3-dimensional models using Dental Slice software (Bioparts, Brasília, Brazil). The mean angular deviation was 2.54° ± 0.71°. The deviations found for the coronal, central, and apical positions were 1.3 ± 0.77 mm, 1.49 ± 0.58 mm, and 2.13 ± 1.32 mm, respectively.
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Affiliation(s)
| | - Jaques Luiz
- 2 Private practice, Curitiba, Paraná, Brazil
| | - Rubens Moreno de Freitas
- 1 Department of Postgraduation, Latin American Institute of Dental Research and Education - ILAPEO, Curitiba, Paraná, Brazil
| | - Luis Eduardo Marques Padovan
- 1 Department of Postgraduation, Latin American Institute of Dental Research and Education - ILAPEO, Curitiba, Paraná, Brazil
| | - Geninho Thomé
- 1 Department of Postgraduation, Latin American Institute of Dental Research and Education - ILAPEO, Curitiba, Paraná, Brazil
| | - Fernanda Faot
- 3 School of Dentistry, Department of Restorative Dentistry, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
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Presurgical Cone Beam Computed Tomography Bone Quality Evaluation for Predictable Immediate Implant Placement and Restoration in Esthetic Zone. Case Rep Dent 2017; 2017:1096365. [PMID: 28321342 PMCID: PMC5340929 DOI: 10.1155/2017/1096365] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 01/17/2017] [Accepted: 02/01/2017] [Indexed: 12/25/2022] Open
Abstract
Despite numerous advantages over multislice computed tomography (MSCT), including a lower radiation dose to the patient, shorter acquisition times, affordable cost, and sometimes greater detail with isotropic voxels used in reconstruction, allowing precise measurements, cone beam computed tomography (CBCT) is still controversial regarding bone quality evaluation. This paper presents a brief review of the literature on accuracy and reliability of bone quality assessment with CBCT and a case report with step-by-step predictable treatment planning in esthetic zone, based on CBCT scans which enabled the clinician to evaluate, depending on bone volume and quality, whether immediate restoration with CAD-CAM manufactured temporary crown and flapless surgery may be a treatment option.
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Suzuki S, Ichikawa K, Tamaki S. [Image Quality and Clinical Usefulness of Ray-summation Image Reconstructed from CT Data, Compared with Digital Radiography]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2017; 73:372-381. [PMID: 28529251 DOI: 10.6009/jjrt.2017_jsrt_73.5.372] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ray-summation (raysum) images reconstructed from computed tomography (CT) volume data resemble digital radiography (DR) images. Therefore, they have a potential to be used instead of DR images.The aim of this study was to compare the physical image quality evaluated by signal-difference-to-noise ratio (SDNR) and clinical usefulness between raysum and DR images. We employed an oval water phantom simulating adult abdomen for image quality measurement. Raysum images were reconstructed from CT volume data using an assumed x-ray quality of 70 keV. DR images were obtained using an indirect-type flat panel detector system. The normalized noise-power spectrum (NNPS) for various same dose indices (DR: entrance surface dose, CT: CT dose index volume) were measured from raysum and DR images. SDNRs were calculated from the results of NNPSs, modulation transfer function (MTF), and cartilage material contrast. Five experienced observers visually compared each pair of a clinical raysum image and a DR image for nine clinical cases (head, finger, pelvis, and foot). MTF of raysum was significantly lower than that of DR. SDNRs of DR were superior to those of raysum for each dose index, by an average factor of 1.24. For head and pelvis images, raysum images were comparable or a little superior compared with the DR images, because the radiation doses of raysum was much higher than those of DR. For finger and foot cases, the raysum images were inferior to DR images due to its lower resolution. Our results indicated a limited clinical usefulness of raysum compared with DR.
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Affiliation(s)
- Shogo Suzuki
- Graduate School of Medical Science, Kanazawa University
- Department of Radiological Technology, Kariya Toyota General Hospital
| | - Katsuhiro Ichikawa
- Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
| | - Shigeru Tamaki
- Department of Radiological Technology, Kariya Toyota General Hospital
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Wada M, Tsuiki Y, Suganami T, Ikebe K, Sogo M, Okuno I, Maeda Y. The relationship between the bone characters obtained by CBCT and primary stability of the implants. Int J Implant Dent 2016; 1:3. [PMID: 27747625 PMCID: PMC4981004 DOI: 10.1186/s40729-014-0003-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 11/20/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The aim of this study is to investigate the correlation between the thickness of the cortical bone or the voxel values that are obtained by cone beam CT (CBCT) and the insertion torque values (ITVs) or the implant stability quotient (ISQ) values. METHODS A pig's ilium was used as the implant placement site. The implants used in this study were two kinds of diameters (3.8 mm, 5.0 mm) and two kinds of lengths (7.0 mm, 12.0 mm) having a general threadlike shape with a mechanically polished surface. To measure the bone density and the cortical thickness around the implants accurately, the CBCT scanning was performed immediately just after the formation of the implant cavity. The initial stabilities were evaluated by the ITVs and the ISQ values. The bone density and cortical thickness around the implants were measured by an implant simulation software (Landmarker ver. 5.0 with special specifications for this study). The relationships of the thickness of the cortical bone and the voxel values with the ITVs and the ISQ values were analyzed using Pearson's correlation coefficient. To evaluate the influence on the ITVs and the ISQ values among multiple factors, multiple regression analysis was performed. P < 0.05 was considered statistically significant. RESULTS A significant positive correlation was found between the thickness of the cortical bone and the ITVs or the ISQ values in all kinds of implants. In addition, a significant positive correlation was also found between the voxel values and the ITVs. From the multiple regression analysis, the thickness of the cortical bone and the voxel values had a positive influence on the ITVs and the ISQ values. In addition, the length of the implant had a positive influence on the ISQ values at the 3.8-mm-diameter implant. CONCLUSIONS In this limited study, there were correlations between the thickness of the cortical bone or the voxel values obtained from the CBCT scanning and the implant stabilities. Besides, it was confirmed that the thickness of the cortical bone, the voxel value, and the implant length had positive correlations with the ITVs and the ISQ values.
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Affiliation(s)
- Masahiro Wada
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Yasutane Tsuiki
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Tohru Suganami
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Motofumi Sogo
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Ikuhisa Okuno
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yoshinobu Maeda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
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The Relevance of the Use of Radiographic Planning in Order to Avoid Complications in Mandibular Implantology: A Retrospective Study. BIOMED RESEARCH INTERNATIONAL 2016; 2016:8175284. [PMID: 27294136 PMCID: PMC4880709 DOI: 10.1155/2016/8175284] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 03/17/2016] [Accepted: 04/11/2016] [Indexed: 11/17/2022]
Abstract
The aim of this retrospective radiological study was to evaluate the variability of the mandibular anatomy in the presence and absence of teeth and to consider how it could influence implant planning. 187 mandibular CT DentaScans were selected from our department archive according to the inclusion criteria. The axial height, vertical height, angulation of the bone crest, and the bone available for ideal implant placement were measured. The analysis of the data shows that the mandible contour presents a constant degree of angulation. The variation of angulation in the absence of teeth was statistically significant only in the region between the canine and the first premolar and in that between the second premolar and the first molar. The difference between the crest height and the available distance to place the implant was greater in the region of the second molar while in the other regions the implant planning was made complex by postextraction resorption. Alveolar bone resorption after tooth loss can be considered as a risk factor for lingual cortical perforation during the insertion of an implant. To avoid potential intra/postoperative complications, 3D radiographic examination is recommended in order to study the mandibular anatomy and identify the risk areas.
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Novel CBCT and optical scanner-based implant treatment planning using a stereolithographic surgical guide: a multipronged diagnostic approach. IMPLANT DENT 2016; 23:401-6. [PMID: 25051414 DOI: 10.1097/id.0000000000000128] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
This report describes the use of the combination of 2 technologies (Cone-beam computed tomography and Optical 3-dimensional scan) to maximize accuracy of implant placement in an area where previous implants failed and had to be removed. This report also stresses the increased efficiency of combining technologies to fabricate stereolithographic surgical guide which, when used intraoperatively, can improve precision of placement.
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Nikiforidou M, Tsalikis L, Angelopoulos C, Menexes G, Vouros I, Konstantinides A. Classification of periodontal biotypes with the use of CBCT. A cross-sectional study. Clin Oral Investig 2015; 20:2061-2071. [PMID: 26689570 DOI: 10.1007/s00784-015-1694-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 12/14/2015] [Indexed: 01/03/2023]
Abstract
OBJECTIVES The aim of this study is to investigate the relationship between periodontal morphometric parameters and to develop a biotype classification based on the variables examined with the use of cone-beam computed tomography (CBCT). MATERIALS AND METHODS Forty-two periodontally healthy subjects that underwent a CBCT examination as part of a different diagnostic procedure participated in the study. Measurements were performed on sectional images and included gingival thickness and labial bone plate thickness midbuccally, crown width to crown length ratio, bone crest to the CEJ distance and bone crest to the gingival margin distance midbuccally, and at the approximal aspects of 186 maxillary anterior teeth. RESULTS Gingival thickness at the level of CEJ was positively correlated with labial bone plate thickness and crown form. Crown form was not correlated with labial bone plate thickness. Cluster analysis supported the existence of four periodontal biotypes, "thin," "thick," "average," and "mixed." Labial bone plate thickness was thinner than 1 mm at 70 % of the measured sites. CONCLUSIONS Only 50 % of the teeth belonged to thin or thick biotype. The other 50 % of the teeth belonged to the average cluster or presented mixed characteristics. Assessment of labial bone plate thickness based on periodontal biotype should be made with caution. CLINICAL RELEVANCE Taking into consideration the characteristics of periodontal biotypes enables the clinician to avoid complications in periodontology, prosthetic dentistry, implant dentistry in the esthetic zone, and orthodontics.
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Affiliation(s)
- Maria Nikiforidou
- Department of Preventive Dentistry, Periodontology and Implant Biology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece.
| | - Lazaros Tsalikis
- Department of Preventive Dentistry, Periodontology and Implant Biology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
| | - Christos Angelopoulos
- Department of Oral Surgery, Implantology and Roentgenology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
| | - Georgios Menexes
- School of Agriculture, Laboratory of Agronomy, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
| | - Ioannis Vouros
- Department of Preventive Dentistry, Periodontology and Implant Biology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
| | - Antonios Konstantinides
- Department of Preventive Dentistry, Periodontology and Implant Biology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
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Dabas J, Mohanty S, Chaudhary Z, Rani A. Assessment of Mandibular Distraction Regenerate Using Ultrasonography and Cone Beam Computed Tomography: A Clinical Study. Craniomaxillofac Trauma Reconstr 2015; 9:69-75. [PMID: 26889351 DOI: 10.1055/s-0035-1563700] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Accepted: 07/05/2015] [Indexed: 10/23/2022] Open
Abstract
Distraction osteogenesis (DO) is becoming a popular method of reconstruction for maxillofacial bony deformities or defects secondary to trauma or surgical tumor ablation. However, the technique is very sensitive in terms of the rate and rhythm of distraction. Because of this, there is a need for monitoring of the distraction regenerate during the distraction as well as the consolidation period. The present study was conducted to assess the regenerate using two imaging modalities, namely, ultrasonography (USG) and cone beam computed tomography (CBCT) to determine their relative efficacies and to weigh their clinical usefulness in assessment of DO regenerate. The study was conducted on 12 patients (18 sites) who underwent mandibular distraction for correction of facial deformities. The results showed that overall USG correlated better with the condition of regenerate (r = 0.606) as compared with CBCT (r = 0.476). However, USG was less effective as compared with CBCT in assessing the regenerate once corticomedullary differentiation occurred in the bone.
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Affiliation(s)
- Jitender Dabas
- Department of Oral and Maxillofacial Surgery, Maulana Azad Institute of Dental Sciences, New Delhi, India
| | - Sujata Mohanty
- Department of Oral and Maxillofacial Surgery, Maulana Azad Institute of Dental Sciences, New Delhi, India
| | - Zainab Chaudhary
- Department of Oral and Maxillofacial Surgery, Maulana Azad Institute of Dental Sciences, New Delhi, India
| | - Amita Rani
- Department of Pediatric Dentistry, Guru Tegh Bahadur Hospital, New Delhi, India
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Ali AS, Fteita D, Kulmala J. Comparison of physical quality assurance between Scanora 3D and 3D Accuitomo 80 dental CT scanners. Libyan J Med 2015; 10:28038. [PMID: 26091832 PMCID: PMC4475257 DOI: 10.3402/ljm.v10.28038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 05/14/2015] [Accepted: 05/15/2015] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The use of cone beam computed tomography (CBCT) in dentistry has proven to be useful in the diagnosis and treatment planning of several oral and maxillofacial diseases. The quality of the resulting image is dictated by many factors related to the patient, unit, and operator. MATERIALS AND METHODS In this work, two dental CBCT units, namely Scanora 3D and 3D Accuitomo 80, were assessed and compared in terms of quantitative effective dose delivered to specific locations in a dosimetry phantom. Resolution and contrast were evaluated in only 3D Accuitomo 80 using special quality assurance phantoms. RESULTS Scanora 3D, with less radiation time, showed less dosing values compared to 3D Accuitomo 80 (mean 0.33 mSv, SD±0.16 vs. 0.18 mSv, SD±0.1). Using paired t-test, no significant difference was found in Accuitomo two scan sessions (p>0.05), while it was highly significant in Scanora (p>0.05). The modulation transfer function value (at 2 lp/mm), in both measurements, was found to be 4.4%. The contrast assessment of 3D Accuitomo 80 in the two measurements showed few differences, for example, the grayscale values were the same (SD=0) while the noise level was slightly different (SD=0 and 0.67, respectively). CONCLUSIONS The radiation dose values in these two CBCT units are significantly less than those encountered in systemic CT scans. However, the dose seems to be affected more by changing the field of view rather than the voltage or amperage. The low doses were at the expense of the image quality produced, which was still acceptable. Although the spatial resolution and contrast were inferior to the medical images produced in systemic CT units, the present results recommend adopting CBCTs in maxillofacial imaging because of low radiation dose and adequate image quality.
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Affiliation(s)
- Ahmed S Ali
- Laboratory of Biophysics, Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Turku, Finland
- Department of Pediatric Dentistry, Faculty of Dentistry, Benghazi University, Benghazi, Libya;
| | - Dareen Fteita
- Laboratory of Biophysics, Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Turku, Finland
| | - Jarmo Kulmala
- Laboratory of Biophysics, Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Turku, Finland
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Hsu JT, Chen YJ, Ho JT, Huang HL, Wang SP, Cheng FC, Wu J, Tsai MT. A comparison of micro-CT and dental CT in assessing cortical bone morphology and trabecular bone microarchitecture. PLoS One 2014; 9:e107545. [PMID: 25226587 PMCID: PMC4166457 DOI: 10.1371/journal.pone.0107545] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Accepted: 08/11/2014] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE The objective of this study was to evaluate the relationship between the trabecular bone microarchitecture and cortical bone morphology by using micro-computed tomography (micro-CT) and dental cone-beam computed tomography (dental CT). MATERIALS AND METHODS Sixteen femurs and eight fifth lumbar vertebrae were collected from eight male Sprague Dawley rats. Four trabecular bone microarchitecture parameters related to the fifth lumbar vertebral body (percent bone volume [BV/TV], trabecular thickness [TbTh], trabecular separation [TbSp], and trabecular number [TbN]) were calculated using micro-CT. In addition, the volumetric cancellous bone grayscale value (vCanGrayscale) of the fifth lumbar vertebral body was measured using dental CT. Furthermore, four cortical bone morphology parameters of the femoral diaphysis (total cross-sectional area [TtAr], cortical area [CtAr], cortical bone area fraction [CtAr/TtAr], and cortical thickness [CtTh]) were calculated using both micro-CT and dental CT. Pearson analysis was conducted to calculate the correlation coefficients (r) of the micro-CT and dental CT measurements. Paired-sample t tests were used to compare the differences between the measurements of the four cortical bone morphology parameters obtained using micro-CT and dental CT. RESULTS High correlations between the vCanGrayscale measured using dental CT and the trabecular bone microarchitecture parameters (BV/TV [r = 0.84] and TbTh [r = 0.84]) measured using micro-CT were observed. The absolute value of the four cortical bone morphology parameters may be different between the dental CT and micro-CT approaches. However, high correlations (r ranged from 0.71 to 0.90) among these four cortical bone morphology parameters measured using the two approaches were obtained. CONCLUSION We observed high correlations between the vCanGrayscale measured using dental CT and the trabecular bone microarchitecture parameters (BV/TV and TbTh) measured using micro-CT, in addition to high correlations between the cortical bone morphology measured using micro-CT and dental CT. Further experiments are necessary to validate the use of dental CT on human bone.
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Affiliation(s)
- Jui-Ting Hsu
- School of Dentistry, College of Medicine, China Medical University, Taichung, Taiwan
| | - Ying-Ju Chen
- Stem Cell Medical Research Center, Department of Medical Research, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Jung-Ting Ho
- School of Dentistry, College of Medicine, China Medical University, Taichung, Taiwan
| | - Heng-Li Huang
- School of Dentistry, College of Medicine, China Medical University, Taichung, Taiwan
| | - Shun-Ping Wang
- Department of Orthopaedics, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Fu-Chou Cheng
- Stem Cell Medical Research Center, Department of Medical Research, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Jay Wu
- Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, Taiwan
| | - Ming-Tzu Tsai
- Department of Biomedical Engineering, Hungkuang University, Taichung, Taiwan
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Leiva-Salinas C, Flors L, Gras P, Más-Estellés F, Lemercier P, Patrie JT, Wintermark M, Martí-Bonmatí L. Dental flat panel conebeam CT in the evaluation of patients with inflammatory sinonasal disease: Diagnostic efficacy and radiation dose savings. AJNR Am J Neuroradiol 2014; 35:2052-7. [PMID: 24970545 DOI: 10.3174/ajnr.a4019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE CT is the imaging modality of choice to study the paranasal sinuses; unfortunately, it involves significant radiation dose. Our aim was to assess the diagnostic validity, image quality, and radiation-dose savings of dental conebeam CT in the evaluation of patients with suspected inflammatory disorders of the paranasal sinuses. MATERIAL AND METHODS We prospectively studied 40 patients with suspected inflammatory disorders of the sinuses with dental conebeam CT and standard CT. Two radiologists analyzed the images independently, blinded to clinical information. The image quality of both techniques and the diagnostic validity of dental conebeam CT compared with the reference standard CT were assessed by using 3 different scoring systems. Image noise, signal-to-noise ratio, and contrast-to-noise ratio were calculated for both techniques. The absorbed radiation dose to the lenses and thyroid and parotid glands was measured by using a phantom and dosimeter chips. The effective radiation dose for CT was calculated. RESULTS All dental conebeam CT scans were judged of diagnostic quality. Compared with CT, the conebeam CT image noise was 37.3% higher (P < .001) and the SNR of the bone was 75% lower (P < .001). The effective dose of our conebeam CT protocol was 23 μSv. Compared with CT, the absorbed radiation dose to the lenses and parotid and thyroid glands with conebeam CT was 4%, 7.8%, and 7.3% of the dose delivered to the same organs by conventional CT (P < .001). CONCLUSIONS Dental conebeam CT is a valid imaging procedure for the evaluation of patients with inflammatory sinonasal disorders.
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Affiliation(s)
- C Leiva-Salinas
- From the Departments of Radiology and Medical Imaging (C.L.-S., L.F., F.M.-E., P.L., L.M.-B.) Departments of Radiology and Medical Imaging (C.L.-S., L.F., M.W.)
| | - L Flors
- From the Departments of Radiology and Medical Imaging (C.L.-S., L.F., F.M.-E., P.L., L.M.-B.) Departments of Radiology and Medical Imaging (C.L.-S., L.F., M.W.)
| | | | - F Más-Estellés
- From the Departments of Radiology and Medical Imaging (C.L.-S., L.F., F.M.-E., P.L., L.M.-B.) ERESA (F.M.-E.)
| | - P Lemercier
- From the Departments of Radiology and Medical Imaging (C.L.-S., L.F., F.M.-E., P.L., L.M.-B.)
| | - J T Patrie
- Public Health Sciences (J.T.P.), University of Virginia, Charlottesville, Virginia
| | - M Wintermark
- Departments of Radiology and Medical Imaging (C.L.-S., L.F., M.W.)
| | - L Martí-Bonmatí
- From the Departments of Radiology and Medical Imaging (C.L.-S., L.F., F.M.-E., P.L., L.M.-B.) GIBI Research Group (L.M.-B.), Hospital Universitario y Politécnico la Fe, Valencia, Spain
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21
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Topographic analysis of maxillary premolars and molars and maxillary sinus using cone beam computed tomography. IMPLANT DENT 2013; 21:528-35. [PMID: 23114831 DOI: 10.1097/id.0b013e31827464fc] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
PURPOSE This study evaluated the anatomical characteristics of the maxillary premolars and molars and the maxillary sinus using cone beam computed tomography (CBCT) for dental implant treatment. MATERIALS AND METHODS Ten linear items and 1 angular item on 30 sites in 30 patients were measured on 3-dimensional computed tomography images using CBCT. The vertical relationship between the maxillary sinus and the maxillary molars was classified into 5 categories. RESULTS The horizontal thickness of the buccal alveolar bone was thinnest on the maxillary first premolars, and the horizontal thickness of the palatal alveolar bone was thickest on the maxillary second molars. Type II was most common on the maxillary first molars. The internal angle at the maxillary premolars was significantly greater than that at the maxillary molars. The internal angle and vertical distance between the apex of the roots and the maxillary sinus floor showed a positive correlation on the maxillary first premolars (P = 0.003). CONCLUSION For the selection of an appropriate approach on dental implant treatment, the evaluation of maxillary premolars and molars using of CBCT can be recommended.
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22
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Hsu JT, Wang SP, Huang HL, Chen YJ, Wu J, Tsai MT. The assessment of trabecular bone parameters and cortical bone strength: A comparison of micro-CT and dental cone-beam CT. J Biomech 2013; 46:2611-8. [DOI: 10.1016/j.jbiomech.2013.08.004] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 08/15/2013] [Accepted: 08/16/2013] [Indexed: 11/26/2022]
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23
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Associations between the articular eminence inclination and condylar bone changes, condylar movements, and condyle and fossa shapes. Oral Radiol 2013. [DOI: 10.1007/s11282-013-0149-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Dellavia C, Speroni S, Pellegrini G, Gatto A, Maiorana C. A new method to evaluate volumetric changes in sinus augmentation procedure. Clin Implant Dent Relat Res 2013; 16:684-90. [PMID: 23509966 DOI: 10.1111/cid.12058] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND In sinus augmentation procedure, the assessment of volume changes of grafted materials is important both in the clinical practice and in dental research to evaluate the features of filling materials. PURPOSE In this study, we assessed the repeatability of a new method proposed to evaluate volumetric changes following sinus lift augmentation procedure. MATERIALS AND METHODS In 10 patients, maxillary sinus augmentation procedure with simultaneous implant placement was performed. Maxillary cone beam computer tomographies were taken 1 week after surgery (T1) and 6 months after surgery (T2). At each evaluation the gap inside the implant between the fixture and the bottom of the screw was used as reference point (Rp), and a standardized volume of interest (VOI) centered on the Rp was selected. Masks were chosen to select the graft and bone tissue within the VOI; the volume at T1, T2, and the difference of volume between T1 and T2 were computed. Expert and non-expert operators performed the analysis. Method errors were computed. RESULTS The error of the method was 1% for both intra-operator and inter-operator measurements. Tissue contraction at T2 was 19 ± 4% of the total initial volume. CONCLUSIONS The standardization of the method allows to obtain repeatable measurements.
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Affiliation(s)
- Claudia Dellavia
- Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, Milan, Italy
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25
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Shweel M, Amer MI, El-shamanhory AF. A comparative study of cone-beam CT and multidetector CT in the preoperative assessment of odontogenic cysts and tumors. THE EGYPTIAN JOURNAL OF RADIOLOGY AND NUCLEAR MEDICINE 2013. [DOI: 10.1016/j.ejrnm.2012.12.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Adibi S, Zhang W, Servos T, O’Neill PN. Cone Beam Computed Tomography in Dentistry: What Dental Educators and Learners Should Know. J Dent Educ 2012. [DOI: 10.1002/j.0022-0337.2012.76.11.tb05404.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shawn Adibi
- Department of General Practice and Dental Public Health; University of Texas School of Dentistry at Houston
| | - Wenjian Zhang
- Department of Diagnostic and Biomaterial Sciences; University of Texas School of Dentistry at Houston
| | - Tom Servos
- Department of General Practice and Dental Public Health; University of Texas School of Dentistry at Houston
| | - Paula N. O’Neill
- Department of Diagnostic and Biomaterial Sciences; University of Texas School of Dentistry at Houston
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Patcas R, Markic G, Müller L, Ullrich O, Peltomäki T, Kellenberger CJ, Karlo CA. Accuracy of linear intraoral measurements using cone beam CT and multidetector CT: a tale of two CTs. Dentomaxillofac Radiol 2012; 41:637-44. [PMID: 22554987 DOI: 10.1259/dmfr/21152480] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
OBJECTIVES The aim was to compare the accuracy of linear bone measurements of cone beam CT (CBCT) with multidetector CT (MDCT) and validate intraoral soft-tissue measurements in CBCT. METHODS Comparable views of CBCT and MDCT were obtained from eight intact cadaveric heads. The anatomical positions of the gingival margin and the buccal alveolar bone ridge were determined. Image measurements (CBCT/MDCT) were performed upon multiplanar reformatted data sets and compared with the anatomical measurements; the number of non-assessable sites (NASs) was evaluated. RESULTS Radiological measurements were accurate with a mean difference from anatomical measurements of 0.14 mm (CBCT) and 0.23 mm (MDCT). These differences were statistically not significant, but the limits of agreement for bone measurements were broader in MDCT (-1.35 mm; 1.82 mm) than in CBCT (-0.93 mm; 1.21 mm). The limits of agreement for soft-tissue measurements in CBCT were smaller (-0.77 mm; 1.07 mm), indicating a slightly higher accuracy. More NASs occurred in MDCT (14.5%) than in CBCT (8.3%). CONCLUSIONS CBCT is slightly more reliable for linear measurements than MDCT and less affected by metal artefacts. CBCT accuracy of linear intraoral soft-tissue measurements is similar to the accuracy of bone measurements.
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Affiliation(s)
- R Patcas
- Clinic for Orthodontics and Pediatric Dentistry, Center of Dental Medicine, University of Zurich, and Department of Diagnostic Imaging, University Children's Hospital Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland.
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Dave M, Davies J, Wilson R, Palmer R. A comparison of cone beam computed tomography and conventional periapical radiography at detecting peri-implant bone defects. Clin Oral Implants Res 2012; 24:671-8. [DOI: 10.1111/j.1600-0501.2012.02473.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/25/2012] [Indexed: 11/29/2022]
Affiliation(s)
- Meetal Dave
- Department of Restorative Dentistry; King's College London Dental Institute; Tower Wing; Guy's Hospital Campus; London; SE1 9RT; UK
| | - Jonathan Davies
- Dental & Maxillofacial Radiological Imaging; Guy's and St Thomas' Hospitals Foundation Trust; London; SE1 9RT; UK
| | - Ron Wilson
- Department of Restorative Dentistry; King's College London Dental Institute; Tower Wing; Guy's Hospital Campus; London; SE1 9RT; UK
| | - Richard Palmer
- Department of Restorative Dentistry; King's College London Dental Institute; Tower Wing; Guy's Hospital Campus; London; SE1 9RT; UK
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González-García R, Monje F. The reliability of cone-beam computed tomography to assess bone density at dental implant recipient sites: a histomorphometric analysis by micro-CT. Clin Oral Implants Res 2012; 24:871-9. [DOI: 10.1111/j.1600-0501.2011.02390.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2011] [Indexed: 11/30/2022]
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Durack C, Patel S. Cone beam computed tomography in endodontics. Braz Dent J 2012; 23:179-91. [DOI: 10.1590/s0103-64402012000300001] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 06/10/2012] [Indexed: 11/21/2022] Open
Abstract
Cone beam computed tomography (CBCT) is a contemporary, radiological imaging system designed specifically for use on the maxillo-facial skeleton. The system overcomes many of the limitations of conventional radiography by producing undistorted, three-dimensional images of the area under examination. These properties make this form of imaging particularly suitable for use in endodontics. The clinician can obtain an enhanced appreciation of the anatomy being assessed, leading to an improvement in the detection of endodontic disease and resulting in more effective treatment planning. In addition, CBCT operates with a significantly lower effective radiation dose when compared with conventional computed tomography (CT). The purpose of this paper is to review the current literature relating to the limitations and potential applications of CBCT in endodontic practice.
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Chindasombatjaroen J, Kakimoto N, Shimamoto H, Murakami S, Furukawa S. Correlation between pixel values in a cone-beam computed tomographic scanner and the computed tomographic values in a multidetector row computed tomographic scanner. J Comput Assist Tomogr 2011; 35:662-5. [PMID: 21926866 DOI: 10.1097/rct.0b013e31822d9725] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES The study's objectives were to investigate the correlation between pixel values obtained from a cone-beam computed tomographic (CBCT) scanner and the computed tomographic (CT) values from a multidetector row CT scanner and to determine whether they have a linear relationship at various tube voltages and tube currents. METHODS A phantom with different concentrations of contrast medium at the center of a multidetector row CT and a CBCT scanner was scanned at various imaging parameters. Computed tomographic values and pixel values were measured using ImageJ. Regression analysis was performed, as well as correlation tests with a Pearson correlation coefficient. RESULTS A significant correlation between pixel values and the CT values of the same specimen was observed (P < 0.0001), and a linear relationship was found between the values from the 2 scanners at each parameter. CONCLUSIONS A high correlation and linear relationship between the CT values and pixel values were found at each parameter. Therefore, linear functions can be used to convert a pixel value from the CBCT machine used in this study to the CT values.
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Affiliation(s)
- Jira Chindasombatjaroen
- Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, Osaka, Japan
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MR-Imaging of teeth and periodontal apparatus: an experimental study comparing high-resolution MRI with MDCT and CBCT. Eur Radiol 2011; 21:2575-83. [PMID: 21805369 DOI: 10.1007/s00330-011-2209-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 05/24/2011] [Accepted: 06/20/2011] [Indexed: 12/31/2022]
Abstract
OBJECTIVES The aim of this study was (1) to assess the ability of magnetic resonance imaging (MRI) to visualize dental and periodontal structures and (2) to compare findings with multidetector computed tomography (MDCT) and cone beam CT (CBCT). MATERIALS AND METHODS Four porcine mandibles were examined with (1) 3T-MRI, (2) MDCT and (3) CBCT. Two observers independently reviewed MR, MDCT and CBCT images and assessed image quality of different dental and periodontal structures. To assess quantitatively the accuracy of the different imaging technique, both observers measured burr holes, previously drilled in the mandibles. RESULTS Dental structures, e.g. teeth roots, pulpa chamber and dentin, were imaged accurately with all imaging sources. Periodontal space and cortical/trabecular bone were better visualized by MRI (p < 0.001). MRI could excellently display the lamina dura, not detectable with MDCT and only inconstant visible with CBCT (p < 0.001). Burr hole measurements were highly precise with all imaging techniques. CONCLUSIONS This experimental study shows the diagnostic feasibility of MRI in visualization of teeth and periodontal anatomy. Detection of periodontal structures was significantly better with MRI than with MDCT or CBCT. Prospective trials have to evaluate further the potential benefit of MRI in a clinical setting.
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Tomasi C, Bressan E, Corazza B, Mazzoleni S, Stellini E, Lith A. Reliability and reproducibility of linear mandible measurements with the use of a cone-beam computed tomography and two object inclinations. Dentomaxillofac Radiol 2011; 40:244-50. [PMID: 21493881 DOI: 10.1259/dmfr/17432330] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE The aim of this study was to assess the influence of inclination of the object on the reliability and reproducibility of linear measurements of anatomic structures of the mandible on images obtained using cone-beam CT (CBCT). METHODS Ten linear dimensions between anatomical landmarks were measured in a dry mandible. The measurements were performed with a manual calliper three times by three observers. The mandible was scanned with Planmeca Promax 3D cone-beam CT (Planmeca Oy, Helsinki, Finland) with the base of the mandible parallel as well as tilted 45° to the horizontal plane. Computer measurements of the linear dimension were performed by three observers. The radiographic measurements were performed four times for each experimental setting. A total of 240 measurements were performed. Reproducibility was evaluated through comparison of standard deviation (SD) and estimation of intraclass correlation coefficient (ICC). The error was estimated as the absolute difference between the radiographic measurements and the mean manual calliper measurements. RESULTS The mean SD for the radiographic measurements was 0.36 mm for the horizontally positioned mandible and 0.48 mm for the inclined mandible. The ICC between examiners was 0.996 mm, between sessions was 0.990 mm and between CBCT measurements and calliper was 0.992 mm. The overall absolute mean measurement error was 0.40 mm (SD 0.39 mm). The percentage of errors that exceeded 1 mm was 6.7%. CONCLUSION The results revealed high reliability of measurements performed on CBCT images independently from object position, examiner's experience and high reproducibility in repeated measurements settings.
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Affiliation(s)
- C Tomasi
- Department of Periodontology, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, Sweden.
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Evaluation of imaging performance of major image guidance systems. Biomed Imaging Interv J 2011; 7:e11. [PMID: 22287985 PMCID: PMC3265149 DOI: 10.2349/biij.7.2.e11] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 01/12/2011] [Accepted: 01/13/2011] [Indexed: 11/17/2022] Open
Abstract
Purpose: The imaging characteristics of two popular kV cone-beam CT (CBCT) and two MVCT systems utilised in image-guided radiation therapy (IGRT) were evaluated. Materials and methods: The study was performed on Varian Clinac iX, Elekta Synergy S, Siemens Oncor, and Tomotherapy. A CT phantom (Catphan-504, Phantom Laboratory, Salem, NY) was scanned for measurements of image quality including image noise, uniformity, density accuracy, spatial resolution, contrast linearity, and contrast resolution. The measurement results were analysed using in-house image analysis software. Reproducibility, position correction, and geometric accuracy were also evaluated with markers in a smaller alignment phantom. The performance evaluation compared volumetric image properties from these four systems with those from a conventional diagnostic CT (CCT). Results: It was shown that the linearity of the two kV CBCT was fairly consistent with CCT. The Elekta CBCT with half-circle 27-cm FOV had higher CT numbers than the other three systems. The image noises of the Elekta kV CBCT, Siemens MV CBCT, and Tomotherapy fan-beam CT (FBCT) are about 2–4 times higher than that of the Varian CBCT. The spatial resolutions of two kV CBCTs and two MV CBCTs were 8-11 lp/cm and 3-5 lp/cm, respectively. Conclusion: Elekta CBCT provided a faster image reconstruction and low dose per scan for half-circle scanning. Varian CBCT had relatively lower image noise. Tomotherapy FBCT had the best uniformity.
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Abstract
Dental implantology based on osseointegration is among the most significant advances in dental science in the last 50 years. Imaging technology contributes to all stages of implant treatment, from presurgical site evaluation to postoperative assessment of integration, and long-term periodic evaluation of implant status. Various imaging modalities have been used for dental implant assessment in the different stages of implant treatment. These include intraoral radiography (film-based and digital), panoramic radiography, computed tomography, cone-beam computed tomography, and others. Selection of the specific imaging technique should be based on its suitability for providing the diagnostic information required by the implant team at different stages of treatment. This article reviews the applications of different imaging technologies and their diagnostic contribution to presurgical evaluation, treatment planning, and postoperative assessment of dental implants.
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Affiliation(s)
- Christos Angelopoulos
- Oral & Maxillofacial Radiology, Columbia University, College of Dental Medicine, 630 West 168th Street, New York, NY 10032, USA.
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Moura PM, Giraldi G, Lira PH, Leite DAQ, Rodrigues PSS, Faria M, Gutfilen B. Image assessment of MSCT and CBCT scans for rapid maxillary expansion: a pilot study. Comput Methods Biomech Biomed Engin 2011; 14:1089-95. [DOI: 10.1080/10255842.2010.511618] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Araki M, Matsumoto K, Matsumoto N, Honda K, Ohki H, Komiyama K. Unusual radiographic appearance of ossifying fibroma in the left mandibular angle. Dentomaxillofac Radiol 2010; 39:314-9. [PMID: 20587656 DOI: 10.1259/dmfr/81820042] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Ossifying fibroma is usually a unilocular lesion with a well-defined, thinly corticated margin radiographically, although various patterns have been noted. The patient was a 27-year-old woman with a painless radiolucent lesion demonstrated on panoramic radiography to involve the root-apex area of the left lower second and third molars. Radiographically, the lesion had some features of a benign tumour, such as an odontogenic myxoma. However, the deep invaginations towards the interalveolar septa suggested a simple bone cyst, whereas the irregular margin and lack of expansion or mandibular canal displacement were consistent with a malignant lesion. A hard tissue component was confirmed only by soft-tissue mode CT. Although this lesion was histopathologically diagnosed as ossifying fibroma, the conflicting imaging findings were challenging and very intriguing.
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Affiliation(s)
- M Araki
- Department of Oral and Maxillofacial Radiology, Dental Research Centre, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan.
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Modern dental imaging: a review of the current technology and clinical applications in dental practice. Eur Radiol 2010; 20:2637-55. [PMID: 20544352 DOI: 10.1007/s00330-010-1836-1] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 04/15/2010] [Accepted: 04/29/2010] [Indexed: 02/02/2023]
Abstract
A review of modern imaging techniques commonly used in dental practice and their clinical applications is presented. The current dental examinations consist of intraoral imaging with digital indirect and direct receptors, while extraoral imaging is divided into traditional tomographic/panoramic imaging and the more recently introduced cone beam computed tomography. Applications, limitations and current trends of these dental "in-office" radiographic techniques are discussed.
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Araki M, Kawashima S, Matsumoto N, Nishimura S, Ishii T, Komiyama K, Honda K. Three-dimensional reconstruction of a fibro-osseous lesion using binary images transformed from histopathological images. Dentomaxillofac Radiol 2010; 39:246-51. [PMID: 20395467 DOI: 10.1259/dmfr/17220113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The aim of this report was to introduce a new method of three-dimensional (3D) reconstruction for fibro-osseous lesions (FOLs) using binary images transformed from histopathological images and to describe its usefulness. A sample of multiconfluent FOL was used (one of the five types of FOL according to a radiographic classification) which was diagnosed histopathologically as ossifying fibroma. Approximately 30 pathological images were assembled into a composite image of the slide using Tiling Boutique software version 3 for Windows (Sanyo Electric, Osaka, Japan). The tiling images were transformed into 8-bit scale images and then into binary images using ImageJ software ver.1.37 (National Institutes of Health, Bethesda, MD). These images were used for 3D reconstruction using ImageJ software. Images were loaded at the same matrix size and were reconstructed into layers of two-dimensional image stacks, adjusted so that contiguous images were aligned based on their centre points, and arranged with long axes horizontal. 3D findings aided the visual understanding of morphological features in the lesion. The 3D reconstruction can be displayed with arbitrary rotation. In this case, the 3D reconstruction, using Real Image software version 4.01 for Windows (KGT, Tokyo, Japan), was created from an arbitrary section. This allowed us to determine the pattern of calcification between groups of connected osteoids and to compare the internal structure of such lesions that are not visible on histopathological findings. Differentiation of features was even more pronounced with a two colour display indicating fibrous connective tissue and osteoid tissue. A 3D reconstruction of a multiconfluent ossifying fibroma was created using binary images transformed from histopathological images. The quality of the images depends above all on the functionality of the image-processing software. Comparison of each pattern of FOL might allow more simple assessment of the morphological features of FOLs.
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Affiliation(s)
- M Araki
- Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan.
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Leung CC, Palomo L, Griffith R, Hans MG. Accuracy and reliability of cone-beam computed tomography for measuring alveolar bone height and detecting bony dehiscences and fenestrations. Am J Orthod Dentofacial Orthop 2010; 137:S109-19. [PMID: 20381751 DOI: 10.1016/j.ajodo.2009.07.013] [Citation(s) in RCA: 205] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2008] [Revised: 07/01/2009] [Accepted: 07/01/2009] [Indexed: 12/19/2022]
Abstract
INTRODUCTION The purpose of this study was to evaluate the accuracy and reliability of cone-beam computed tomography (CBCT) in the diagnosis of naturally occurring fenestrations and bony dehiscences. In addition, we evaluated the accuracy and reliability of CBCT for measuring alveolar bone margins. METHODS Thirteen dry human skulls with 334 teeth were scanned with CBCT technology. Measurements were made on each tooth in the volume-rendering mode from the cusp or incisal tip to the cementoenamel junction and from the cusp or incisal tip to the bone margin along the long axis of the tooth. The accuracy of the CBCT measurements was determined by comparing the means, mean differences, absolute mean differences, and Pearson correlation coefficients with those of direct measurements. Accuracy for detection of defects was determined by using sensitivity and specificity. Positive and negative predictive values were also calculated. RESULTS The CBCT measurements showed mean deviations of 0.1 +/- 0.5 mm for measurements to the cementoenamel junction and 0.2 +/- 1.0 mm to the bone margin. The absolute values of the mean differences were 0.4 +/- 0.3 mm for the cementoenamel junction and 0.6 +/- 0.8 mm for the bone margin. The sensitivity and specificity of CBCT for fenestrations were both about 0.80, whereas the specificity for dehiscences was higher (0.95) and the sensitivity lower (0.40). The negative predictive values were high (>or=0.95), and the positive predictive values were low (dehiscence, 0.50; fenestration, 0.25). The reliability of all measurements was high (r >or=0.94). CONCLUSIONS By using a voxel size of 0.38 mm at 2 mA, CBCT alveolar bone height can be measured to an accuracy of about 0.6 mm, and root fenestrations can be identified with greater accuracy than dehiscences.
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Affiliation(s)
- Cynthia C Leung
- Department of Orthodontics, School of Dental Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
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Carrafiello G, Dizonno M, Colli V, Strocchi S, Pozzi Taubert S, Leonardi A, Giorgianni A, Barresi M, Macchi A, Bracchi E, Conte L, Fugazzola C. Comparative study of jaws with multislice computed tomography and cone-beam computed tomography. Radiol Med 2010; 115:600-11. [PMID: 20177988 DOI: 10.1007/s11547-010-0520-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Accepted: 08/06/2009] [Indexed: 10/19/2022]
Abstract
PURPOSE The aim of this study was to compare the dosimetric and diagnostic performance of multislice computed tomography (MSCT) and cone-beam computed tomography (CBCT) in the study of the dental arches. MATERIALS AND METHODS Effective dose and dose to the main organs of the head and neck were evaluated by means of thermoluminescent dosimeters (TLDs) placed in an Alderson Rando anthropomorphic phantom and using a standard CBCT protocol and an optimised MSCT protocol. Five patients with occlusal plane ranging from 54 cm to 59 cm who needed close follow-up (range 1-3 months) underwent both examinations. Image quality obtained with CBCT and MSCT was evaluated. RESULTS Effective dose and dose to the main organs of the head and neck were higher for MSCT than for CBCT. Image quality of CBCT was judged to be equivalent to that of MSCT for visualising teeth and bone but inferior for visualising soft tissues. Beam-hardening artefacts due to dental-care material and implants were weaker at CBCT than at MSCT. CONCLUSIONS When panoramic radiography is not sufficient in the study of the teeth and jaw bones, CBCT can provide identical information to MSCT, with a considerable dose reduction. MSCT is, however, indicated when evaluation of soft tissue is required.
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Affiliation(s)
- G Carrafiello
- Department of Radiology, University of Insubria, Viale Borri 57, 21100, Varese, Italy
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Yamanaka M, Hironaka S, Ishikawa K, Kanomi R, Mukai Y. Assessment of oropharynx using cone beam computed tomography—Change in volume during oropharynx growth—. PEDIATRIC DENTAL JOURNAL 2010. [DOI: 10.1016/s0917-2394(10)70186-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Suomalainen A, Kiljunen T, Käser Y, Peltola J, Kortesniemi M. Dosimetry and image quality of four dental cone beam computed tomography scanners compared with multislice computed tomography scanners. Dentomaxillofac Radiol 2009; 38:367-78. [PMID: 19700530 DOI: 10.1259/dmfr/15779208] [Citation(s) in RCA: 180] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES The aim of this study was to evaluate the radiation dose and image quality of four dental cone beam CT (CBCT) scanners, and to compare them with those of two multislice CT (MSCT) scanners. METHODS Tissue doses were measured using a tissue-equivalent anthropomorphic RANDO Head Phantom((R)) with thermoluminescence dosemeters (TLD). An RSVP Head Phantom(TM) with a specially designed cylindrical insert was used for comparison of image quality and absorbed dose. Image quality was evaluated in the form of contrast-to-noise ratio (CNR) and modulation transfer function (MTF). RESULTS Using standard imaging parameters, the effective doses varied between 14 microSv and 269 microSv (International Commission on Radiation Protection (ICRP) 1990) and 27 microSv and 674 microSv (ICRP 2008) with the CBCT scanners, and between 350 microSv and 742 microSv (ICRP 1990) and 685 microSv and 1410 microSv (ICRP 2008) with the MSCT scanners. The CNR of the CBCT and MSCT scanners were 8.2-18.8 and 13.6-20.7, respectively. Low-dose MSCT protocols provided CNRs comparable with those from CBCT scanners. The 10% MTF of the CBCT scanners varied between 0.1 mm(-1) and 0.8 mm(-1), and was 0.5 mm(-1) for all the MSCT protocols examined. CONCLUSIONS CBCT scanners provide adequate image quality for dentomaxillofacial examinations while delivering considerably smaller effective doses to the patient. Large variations in patient dose and image quality emphasize the importance of optimizing imaging parameters in both CBCT and MSCT examinations.
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Affiliation(s)
- A Suomalainen
- Department of Radiology, Helsinki University Central Hospital, Helsinki, Finland.
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Watanabe H, Honda E, Tetsumura A, Kurabayashi T. A comparative study for spatial resolution and subjective image characteristics of a multi-slice CT and a cone-beam CT for dental use. Eur J Radiol 2009; 77:397-402. [PMID: 19819091 DOI: 10.1016/j.ejrad.2009.09.023] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Accepted: 09/21/2009] [Indexed: 12/14/2022]
Abstract
PURPOSE Multi-slice CT (MSCT) and cone-beam CT (CBCT) are widely used in dental practice. This study compared the spatial resolution of these CT systems to elucidate which CT modalities should be selected for various clinical cases. MATERIALS AND METHODS As MSCT and CBCT apparatuses, Somatom Sensation 64 and 3D Accuitomo instruments, respectively, were used. As an objective evaluation of spatial resolution of these CT systems, modulation transfer function (MTF) analysis was performed employing an over-sampling method. The results of MTF analysis were confirmed with a line-pair test using CATPHAN. As a subjective evaluation, a microstructure visualization ability study was performed using a Jcl:SD rat and a head CT phantom. RESULTS MTF analysis showed that for the in-plane direction, the z-axis ultrahigh resolution mode (zUHR) of the Sensation 64 and 3D Accuitomo instruments had higher spatial resolutions than the conventional mode (64×) of the Sensation 64, but for the longitudinal direction, the 3D Accuitomo had clearly higher spatial resolution than either mode of the Sensation 64. A line-pair test study and microstructure visualization ability studies confirmed the results for MTF analysis. However, images of the rat and the CT phantom revealed that the 3D Accuitomo demonstrated the failure to visualize the soft tissues along with aliasing and beam-hardening artifacts, which were not observed in the Sensation 64. CONCLUSIONS This study successfully applied spatial resolution analysis using MSCT and CBCT systems in a comparative manner. These findings could help in deciding which CT modality should be selected for various clinical cases.
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Affiliation(s)
- Hiroshi Watanabe
- Oral and Maxillofacial Radiology, Division of Oral Restitution, Graduate School, Tokyo Medical and Dental University, 5-45 Yushima 1-chome, Bunkyo-ku, Tokyo 1138549, Japan.
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Okano T, Harata Y, Sugihara Y, Sakaino R, Tsuchida R, Iwai K, Seki K, Araki K. Absorbed and effective doses from cone beam volumetric imaging for implant planning. Dentomaxillofac Radiol 2009; 38:79-85. [PMID: 19176649 DOI: 10.1259/dmfr/14769929] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES Volumetric CT using a cone beam has been developed by several manufacturers for dentomaxillofacial imaging. The purpose of this study was to measure doses for implant planning with cone beam volumetric imaging (CBVI) in comparison with conventional multidetector CT (MDCT). METHODS The two CBVI systems used were a 3D Accuitomo (J. Morita), including an image-intensifier type (II) and a flat-panel type (FPD), and a CB MercuRay (Hitachi). The 3D Accuitomo operated at 80 kV, 5 mA and 18 s. The CB MercuRay operated at 120 kV, 15 mA, 9.8 s. The MDCT used was a HiSpeed QX/i (GE), operated at 120 kV, 100 mA and 0.7 s, and its scan length was 77 mm for both jaws. Measurement of the absorbed tissue and organ doses was performed with an Alderson phantom, embedding the radiophotoluminescence glass dosemeter into the organs/tissues. The values obtained were converted into the absorbed dose. The effective dose as defined by the International Commission on Radiological Protection was then calculated. RESULTS The absorbed doses of the 3D Accuitomo of the organs in the primary beam ranged from 1-5 mGy, and were several to ten times lower than other doses. The effective dose of the 3D Accuitomo ranged from 18 muSv to 66 muSv, and was an order of magnitude smaller than the others. In conclusion, these results show that the dose in the 3D Accuitomo is lower than the CB MercuRay and much less than MDCT.
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Affiliation(s)
- T Okano
- Department of Radiology, Showa University School of Dentistry, Tokyo, Japan.
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Patel S, Dawood A, Whaites E, Pitt Ford T. New dimensions in endodontic imaging: part 1. Conventional and alternative radiographic systems. Int Endod J 2009; 42:447-62. [DOI: 10.1111/j.1365-2591.2008.01530.x] [Citation(s) in RCA: 217] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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De Vos W, Casselman J, Swennen GRJ. Cone-beam computerized tomography (CBCT) imaging of the oral and maxillofacial region: A systematic review of the literature. Int J Oral Maxillofac Surg 2009; 38:609-25. [PMID: 19464146 DOI: 10.1016/j.ijom.2009.02.028] [Citation(s) in RCA: 503] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Accepted: 02/27/2009] [Indexed: 12/20/2022]
Affiliation(s)
- W De Vos
- Division of Maxillo-Facial Surgery, Department of Surgery, General Hospital St-Jan Bruges, Bruges, Belgium
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Haskell JA, McCrillis J, Haskell BS, Scheetz JP, Scarfe WC, Farman AG. Effects of Mandibular Advancement Device (MAD) on Airway Dimensions Assessed With Cone-Beam Computed Tomography. Semin Orthod 2009. [DOI: 10.1053/j.sodo.2009.02.001] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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