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Corte-Real A, Ribeiro R, Machado R, Silva AM, Nunes T. Digital intraoral and radiologic records in forensic identification: Match with disruptive technology. Forensic Sci Int 2024; 361:112104. [PMID: 38936201 DOI: 10.1016/j.forsciint.2024.112104] [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: 03/04/2024] [Revised: 06/07/2024] [Accepted: 06/11/2024] [Indexed: 06/29/2024]
Abstract
While clinical dentistry has seamlessly integrated the digital revolution, there is a gap in the technological capabilities of forensic dentistry.The study aimed to compare the superimposition accuracy of two different three-dimensional record formats, namely the intraoral scanner and cone beam computer tomography, in the context of forensic identification.The sample consisted of randomly selected adults (n=10) of both sexes aged between 20 and 50 years. Following the acquisition of data using the Medit i700 wireless scanner and the iCAT Tomograph with InVivo software, the records were analysed and compared through superimposition using Medit Scan Clinic software to assess the technical precision of anatomical identification details.The results obtained through the superimposition of dental and bone records following intra- and inter-observer analysis enabled an accurate comparison and identification of an individual. This method can differentiate between positive and negative matches, achieving exclusion results and offering a potential solution to overcoming the absence of a standardisation procedure in human identification.
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Affiliation(s)
- Ana Corte-Real
- University of Coimbra, Forensic Dentistry Laboratory, Faculty of Medicine, Coimbra, Portugal.
| | - Rita Ribeiro
- University of Coimbra, Forensic Dentistry Laboratory, Faculty of Medicine, Coimbra, Portugal.
| | - Ricardo Machado
- University of Coimbra, Forensic Dentistry Laboratory, Faculty of Medicine, Coimbra, Portugal.
| | - Ana Mafalda Silva
- University of Coimbra, Forensic Dentistry Laboratory, Faculty of Medicine, Coimbra, Portugal.
| | - Tiago Nunes
- University of Coimbra, Forensic Dentistry Laboratory, Faculty of Medicine, Coimbra, Portugal.
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2
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Zhao F, Shi L, Huang Y, Wang Y, Yu M, Wang H. Adjacent tooth migration after maxillary first molar loss in patients with sinus augmentation: A retrospective research. Clin Implant Dent Relat Res 2023; 25:1080-1090. [PMID: 37496294 DOI: 10.1111/cid.13250] [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: 04/01/2023] [Revised: 06/23/2023] [Accepted: 07/11/2023] [Indexed: 07/28/2023]
Abstract
PURPOSE The objectives of this study are to: (1) investigate the extent of antagonistic and distal neighboring tooth migration in the maxillary posterior single tooth-missing site during the healing period of bone augmentation and implant surgery; (2) identify factors associated with tooth migration. MATERIALS AND METHODS One hundred and forty-three cases that lost the maxillary first molar were included, and their CBCT data during the edentulous period were obtained. Dentition models were reconstructed from CBCT, and superimpositions were performed, followed by measuring migration distances and calculating migration rates of antagonistic and distal neighboring teeth. Factors were analyzed using multivariate generalized estimating equations (GEE). RESULTS The mean migration distances were 208 ± 137 μm and 403 ± 605 μm for antagonistic teeth and distal teeth, and the mean migration rates were 26.8 ± 21.2 μm/month and 48.5 ± 76.7 μm/month, respectively. One hundred and nineteen out of 143 distal neighboring teeth migrated toward the edentulous site, and all antagonistic teeth migrated occlusally. Occlusal contact loss and chronic apical periodontitis both significantly accelerated antagonistic tooth migration (p < 0.05), the latter also accelerated distal tooth migration (p < 0.05). Besides, the displacement of the distal teeth was somewhat accelerated by the impacted adjacent third molar and root protrusion into the sinus. CONCLUSIONS The neighboring teeth tend to migrate toward the edentulous gap in the maxillary posterior region. Occlusal contact loss and chronic apical periodontitis are two significant risk factors for accelerating antagonistic tooth migration, and for distal teeth, chronic apical periodontitis is the risk factor. The impacted adjacent third molar and root protrusion into the sinus are also potential risk factors for accelerating the migration of the maxillary distal tooth. Thus, to prevent maxillary edentulous gap reduction, the factors mentioned above should be taken into consideration when planning treatment flow.
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Affiliation(s)
- Feiya Zhao
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - Lei Shi
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - Yilun Huang
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - Yu Wang
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - Mengfei Yu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - Huiming Wang
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
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3
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Li N, Wang CJ, Wang Y, Chen D, Yang M, Li H. Three-dimensional finite element analysis of retracting pathological migration of the right upper central incisor with a clear aligner. Comput Methods Biomech Biomed Engin 2023:1-8. [PMID: 37936535 DOI: 10.1080/10255842.2023.2279011] [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: 03/27/2023] [Accepted: 10/23/2023] [Indexed: 11/09/2023]
Abstract
We aimed to explore the best orthodontic step distance of the right upper central incisor with mild, moderate, and severe pathological displacement achieved via a clear aligner. Three-dimensional models of maxilla-tooth-periodontal ligament clear aligner of the right upper central incisors with five different steps of 0.1, 0.125, 0.15, 0.165, 0.25 mm and three different alveolar bone heights were established via finite element analysis. We analysed the changing trends in initial displacement, the periodontal ligament, the alveolar bone, and apical stress of right upper central incisor. In the process of retraction, the right upper central incisor a movement trend of the crown deviating from the distal root to the mesial, and with the decrease of the height of the alveolar bone and the increase of the displacement, the crown would appear distal labial torsion with a deepening trend of vertical overlay.The maximum stress distribution of the periodontal ligament and alveolar bone showed a positive correlation. The overall stress distribution of the periodontal ligament and apical stress increased with decrease of alveolar bone height and the increase of alveolar bone displacement. In patients with mild, moderate, and severe pathological displacement of the right upper central incisor, the best step distance of anterior tooth retraction is 0.165, 0.15, and 0.125 mm, respectively.
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Affiliation(s)
- Na Li
- Silk Crossing Clinic, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
- Department of Stomatology, North Sichuan Medical College, Nanchong, China
| | - Chun Juan Wang
- Chongqing Key Laboratory of Oral Diseases and Biomedicine, Chongqing Municipal Key Laboratory of Stomatological Biomedical Engineering, Chongqing, China
| | - Yu Wang
- Department of Stomatology, North Sichuan Medical College, Nanchong, China
| | - DingGen Chen
- Silk Crossing Clinic, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
- Department of Stomatology, North Sichuan Medical College, Nanchong, China
| | - Min Yang
- Department of Stomatology, North Sichuan Medical College, Nanchong, China
| | - HuiQin Li
- Department of Stomatology, North Sichuan Medical College, Nanchong, China
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Biun J, Dudhia R, Arora H. The in-vitro accuracy of fiducial marker-based versus markerless registration of an intraoral scan with a cone-beam computed tomography scan in the presence of restoration artifact. Clin Oral Implants Res 2023; 34:1257-1266. [PMID: 37602506 DOI: 10.1111/clr.14166] [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: 05/24/2023] [Revised: 07/10/2023] [Accepted: 08/09/2023] [Indexed: 08/22/2023]
Abstract
OBJECTIVES To determine the effect of restoration artifact ('metal artifact') on registration accuracy of an intraoral scan and cone-beam computed tomography (CBCT) scan, comparing fiducial marker-based registration with markerless registration. MATERIALS AND METHODS A maxillary model was fitted with multiple configurations of zirconia crowns to simulate various states of oral rehabilitation. Intraoral scans and CBCT scans (half and full rotation) were acquired. Registration was performed using markerless (point-based registration with surface-based refinement) and fiducial marker-based registration. Each experimental condition was repeated 10 times (n = 320). The absolute deviation was measured at the canines and first molars, and the average and maximum values were analysed using multiple linear regression. RESULTS R2 was 0.874 for average error and 0.858 for maximum error. For markerless registration, there were 0.041 mm (p < .001) and 0.045 mm (p < .001) increases in average and maximum error per crown, respectively. For fiducial marker-based registration, the effect of additional crowns was not statistically significant for average (p = .067) or maximum (p = .438) error. For a full arch of crowns, the regression model predicted average and maximum errors of 0.581 and 0.697 mm for the markerless technique, and 0.185 and 0.210 mm for the fiducial marker-based technique. Overall, the fiducial marker-based technique was more accurate for four or more crowns. The half rotation scan increased average error by 0.021 mm (p = .001) and maximum error by 0.029 mm (p < .001). CONCLUSIONS Under the present study's experimental conditions, the fiducial marker-based technique should be considered if four or more full-coverage highly radiopaque restorations are present.
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Affiliation(s)
- John Biun
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Raahib Dudhia
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Himanshu Arora
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
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5
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Biun J, Dudhia R, Arora H. The influence of metal artifact reduction on the trueness of registration of a cone-beam computed tomography scan with an intraoral scan in the presence of severe restoration artifact. J Prosthodont 2023. [PMID: 37691179 DOI: 10.1111/jopr.13767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 08/21/2023] [Accepted: 09/06/2023] [Indexed: 09/12/2023] Open
Abstract
PURPOSE When planning guided implant surgery, highly radiopaque materials such as metals or zirconia produce streaking artifacts ('metal artifact') on cone-beam computed tomography scans, which can impair registration of the intraoral scan. This study aimed to determine the effect of metal artifact reduction on the trueness of registration in the presence of multiple full-coverage zirconia crowns. MATERIALS AND METHODS A 3D-printed maxillary study model was restored with 12 full-coverage zirconia crowns and scanned with an intraoral scanner. Cone-beam computed tomography scans of the study model were acquired, with and without activation of the metal artifact reduction algorithm. Registration of the optical scans was performed using initial point-based registration with surface-based refinement, and the deviation was measured at four pre-defined dental landmarks. Welch's t-test was used to compare the registration error for the metal artifact reduction group with the control group. RESULTS The average registration error was 0.519 mm (95% CI 0.507 to 0.531) with metal artifact reduction deactivated, compared to 0.478 mm (95% CI 0.460 to 0.496) without metal artifact reduction. Therefore, activation of the metal artifact reduction algorithm was associated with a 0.041 mm (95% CI 0.020 to 0.061, p < 0.001) increase in average registration error. CONCLUSIONS The use of the metal artifact reduction algorithm slightly reduced trueness in this in vitro study. Clinicians are advised not to rely on a metal artifact reduction (MAR) algorithm for registration of a cone-beam computed tomography scan with an intraoral scan when planning guided implant surgery in the presence of restoration artifacts.
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Affiliation(s)
- John Biun
- School of Dentistry, University of Queensland, Herston, Australia
| | - Raahib Dudhia
- School of Dentistry, University of Queensland, Herston, Australia
| | - Himanshu Arora
- School of Dentistry, University of Queensland, Herston, Australia
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Orhan K, Kocyigit D, Firincioglulari M, Adisen MZ, Kocyigit S. Quantitative assessment of image artifacts from zygoma implants on CBCT scans using different exposure parameters. Proc Inst Mech Eng H 2023; 237:1082-1090. [PMID: 37528643 DOI: 10.1177/09544119231190447] [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] [Indexed: 08/03/2023]
Abstract
This study was aimed at quantifying artifacts from zygoma implants in cone-beam computed tomography (CBCT) images using different exposure parameters. Two cadaver heads, one with two zygoma implants on each side and the other for control, were scanned using 18 different exposure parameters. Quantitative analysis was performed to evaluate the hypodense and hyperdense artifact percentages calculated as the percentage of the area. Hyperdense artifacts and hypodense artifacts were detected, followed by the calculation of the hyperdense and hypodense artifact percentages in the image. In the qualitative analysis of the artifacts, the scores used were as follows: absence (0), moderate presence (1), or high presence (2) for hypodense halos, thin hypodense lines, and hyperdense lines. Artifact analysis was performed qualitatively and quantitatively using the post-hoc Tukey and Two-way ANOVA tests. As a result, in the qualitative analyses, zygoma implants showed a significant difference compared to the control group with regard to hyperdense and hypodense artifacts (p < 0.05). There was a significant difference between the means according to the FOV size arithmetic averages (p < 0.05). In terms of voxel size, the difference was found to be significant, where 400 microns showed the highest hypodense artifact while 200 microns showed the lowest hypodense artifact. In conclusion, hypodense and hyperdense artifacts were significantly higher in cadavers with zygoma implants than in controls. As FOV and voxel size increase, more hypodense artifacts are produced by zygoma implants so smaller FOV and voxel sizes should be used to prevent poor image quality of adjacent teeth.
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Affiliation(s)
- Kaan Orhan
- Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Ankara University, Ankara, Turkey
- Medical Design Application and Research Center (MEDITAM), Ankara University, Ankara, Turkey
| | - Doruk Kocyigit
- Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Kirikkale University, Kirkkale, Turkey
| | - Mujgan Firincioglulari
- Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Cyprus International University, Nicosia, Cyprus
| | - Mehmet Zahit Adisen
- Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Kirikkale University, Kirkkale, Turkey
| | - Seda Kocyigit
- Department of Oral and Maxillofacial Surgery, Ministry of Health Turkey, Uskudar, Istanbul, Turkey
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Bukhari A, Dahshan S, Kotina E, Zhao N, Almujel S, Gallucci GO, Hamilton A. Application of 3D-printed guide for locating screw access channels in cement-retained complete arch implant-supported zirconia restorations. J Prosthet Dent 2023:S0022-3913(22)00489-9. [PMID: 36959002 DOI: 10.1016/j.prosdent.2022.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 08/03/2022] [Accepted: 08/04/2022] [Indexed: 03/25/2023]
Abstract
Removal of cement-retained complete arch implant-supported zirconia restorations can be challenging. A predictable and minimally invasive technique combining cone beam computed tomography (CBCT) and intraoral scans with a virtual implant planning software program is described to identify the location of the screw access channels during the retrieval, thus minimizing damage to the existing restoration and allowing reuse.
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Affiliation(s)
- Asmaa Bukhari
- Demonstrator, Department of Prosthodontics, King Abdulaziz University, Jeddah, Saudi Arabia; AGE Implant program, Harvard School of Dental Medicine, Boston, Mass.
| | - Samantha Dahshan
- AGE Implant program, Harvard School of Dental Medicine, Boston, Mass
| | - Elli Kotina
- ITI Scholar Implant program, Harvard School of Dental Medicine, Boston, Mass
| | - Na Zhao
- AGE Implant program, Harvard School of Dental Medicine, Boston, Mass
| | - Saad Almujel
- Demonstrator, Department of Prosthodontics, King Saud University, Riyadh, Saudi Arabia; AGE Implant program, Harvard School of Dental Medicine, Boston, Mass
| | - German O Gallucci
- Associate Professor and Chairman, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Mass
| | - Adam Hamilton
- Discipline Lead in Prosthodontics and Graduate Program Convenor University of Western Australia Dental School, Nedland, Western Australia, Australia; Lecturer, Division of Regenerative and Implant Science, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Mass
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8
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Miotk N, Schwindling FS, Zidan M, Juerchott A, Rammelsberg P, Hosseini Z, Nittka M, Heiland S, Bendszus M, Hilgenfeld T. Reliability and accuracy of intraoral radiography, cone beam CT, and dental MRI for evaluation of peri-implant bone lesions at zirconia implants - an ex vivo feasibility study. J Dent 2023; 130:104422. [PMID: 36649822 DOI: 10.1016/j.jdent.2023.104422] [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: 05/14/2022] [Revised: 01/09/2023] [Accepted: 01/11/2023] [Indexed: 01/15/2023] Open
Abstract
OBJECTIVES To determine the reliability and accuracy of intraoral radiography (IR), cone-beam-computed tomography (CBCT), and dental magnetic resonance imaging (dMRI) in measuring peri‑implant bone defects around single zirconia implants. METHODS Twenty-four zirconia implants were inserted in bovine ribs with various peri‑implant defect sizes and morphologies. True defect extent was measured without implant in CBCT. Defects were measured twice in IR, CBCT, and dMRI with the inserted implant by three experienced readers. Reliability was assessed by ICC, accuracy by the Friedman test, and post-hoc-Tukey's test. RESULTS A comparable good to excellent intra- and inter-reader reliability was observed for all modalities (intra-/inter-rater-CC range for IR; CBCT; dMRI: 0.81-0.91/0.79;0.87-0.97/0.96;0.87-0.95/0.94). Accuracy was generally high, with mean errors below 1 mm in all directions. However, measuring defect depth in the mesiodistal direction was significantly more accurate in dMRI (0.65 ± 0.38 mm) compared to IR (2.71 ± 1.91 mm), and CBCT (1.98 ± 1.97 mm), p-values ≤ 0.0001 respectively ≤ 0.01. CONCLUSIONS Osseous defects around zirconia implants can be reliably measured in IR/CBCT/dMRI in the mesiodistal directions. In addition, CBCT and dMRI allow assessment of the buccolingual directions. dMRI provides a comparable accuracy in all directions, except for the mesiodistal defect depth, where it outperforms IR and CBCT.
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Affiliation(s)
- Nikolai Miotk
- Department of Neuroradiology, Heidelberg University Hospital, Im Neuenheimer Feld 400, Heidelberg 69120, Germany.
| | - Franz Sebastian Schwindling
- Department of Prosthodontics, Heidelberg University Hospital, Im Neuenheimer Feld 400, Heidelberg 69120, Germany.
| | - Moussa Zidan
- Department of Neuroradiology, Heidelberg University Hospital, Im Neuenheimer Feld 400, Heidelberg 69120, Germany.
| | - Alexander Juerchott
- Department of Neuroradiology, Heidelberg University Hospital, Im Neuenheimer Feld 400, Heidelberg 69120, Germany.
| | - Peter Rammelsberg
- Department of Prosthodontics, Heidelberg University Hospital, Im Neuenheimer Feld 400, Heidelberg 69120, Germany.
| | - Zahra Hosseini
- MRI-sequence developer, Magnetic Resonance R&D Collaborations, Siemens Medical Solutions, Atlanta, 3139 Mae Ave NE, Atlanta, GA - Georgia 30319, United States.
| | - Mathias Nittka
- MRI-sequence developer, Magnetic Resonance, Siemens Healthcare GmbH, Erlangen, Enkestraße 127, Erlangen 91052, Germany.
| | - Sabine Heiland
- Department of Neuroradiology, Heidelberg University Hospital, Im Neuenheimer Feld 400, Heidelberg 69120, Germany.
| | - Martin Bendszus
- Department of Neuroradiology, Heidelberg University Hospital, Im Neuenheimer Feld 400, Heidelberg 69120, Germany.
| | - Tim Hilgenfeld
- Department of Neuroradiology, Heidelberg University Hospital, Im Neuenheimer Feld 400, Heidelberg 69120, Germany.
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Hamilton A, Singh A, Friedland B, Jamjoom FZ, Griseto N, Gallucci GO. The impact of cone beam computer tomography field of view on the precision of digital intra-oral scan registration for static computer-assisted implant surgery: A CBCT analysis. Clin Oral Implants Res 2022; 33:1273-1281. [PMID: 36239539 PMCID: PMC10091816 DOI: 10.1111/clr.14009] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 09/11/2022] [Accepted: 10/08/2022] [Indexed: 12/13/2022]
Abstract
OBJECTIVES Registration of intra-oral surface scans to cone beam computer tomography (CBCT) is critical in the digital workflow for static computer-aided implant surgery (sCAIS). This study aimed to assess the impact of CBCT field of view (FoV) on the precision of digital intra-oral scan registration. MATERIALS AND METHODS Cone beam computer tomography data and intra-oral scans from 20 patients were included. Small FoV CBCT's were created by digitally segmenting a large FoV into three sextants. Virtual implant planning was performed. Digital intra-oral scans were repeatedly registered onto their corresponding large and small FoV CBCT datasets. The distances and angulations between the matching implant positions of each repeated registration were used to determine the precision of the registration process. Wilcoxon Signed Rank Paired Tests were used to compare the differences between large FoV and small FoV. The threshold for statistical significance was set at p = .05. RESULTS Differences in 3D implant position based on the registration precision between small FoV and large FoV present at both the implant entry point (0.37 ± 0.25 mm vs 0.35 ± 0.23 mm, p = .482) and implant tip (0.49 ± 0.34 mm vs 0.37 ± 0.24 mm, p < .001). Differences in overall angular precision were observed between small FOV and large FoV (1.43 ± 1.36° vs 0.51 ± 0.38°, p < .001). CONCLUSION CBCT with a small FoV is accompanied by greater precision errors in intra-oral scan registration. However, when sufficient well-distributed teeth are visible in small FoV CBCT, the precision of digital intra-oral scan registration appears to be within clinically acceptable limits for sCAIS.
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Affiliation(s)
- Adam Hamilton
- Division of Regenerative and Implant Sciences, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Massachusetts, USA.,Division of Oral Restorative and Rehabilitative Sciences, The University of Western Australia, Perth, Western Australia, Australia
| | - Ashi Singh
- Division of Regenerative and Implant Sciences, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Massachusetts, USA.,Private Practice, Sydney, New South Wales, Australia
| | - Bernard Friedland
- Department of Oral Medicine, Infection, and Immunity, Harvard School of Dental Medicine, Boston, Massachusetts, USA
| | - Faris Z Jamjoom
- Division of Regenerative and Implant Sciences, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Massachusetts, USA.,Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Riyadh, Saudi Arabia.,King Abdullah International Medical Research Center, National Guard Health Affairs, Riyadh, Saudi Arabia
| | - Neil Griseto
- Division of Regenerative and Implant Sciences, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Massachusetts, USA
| | - German O Gallucci
- Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Massachusetts, USA
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Schulze R. CBCT artefact-burden of zirconia-based as compared to titanium implants for different beam energies: an analytical approach. Sci Rep 2022; 12:15276. [PMID: 36088475 PMCID: PMC9464216 DOI: 10.1038/s41598-022-19379-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 08/29/2022] [Indexed: 11/09/2022] Open
Abstract
AbstractBeam hardening artefacts induced by highly-dense material (e.g. metal) is a common quality issue in maxillofacial Cone Beam Computed Tomography (CBCT-) images. This experimental and analytical study investigated attenuation patterns of two typical dental implant materials: zirconia-ceramic and pure titanium. By application of different x-ray beam energies (60, 70, 80, 90 [kVp]) energy-dependent attenuation of these materials is assessed and the resulting artefact induction in the resulting CBCT-images evaluated. A zirconia (Y-TZP-) implant ($$\varnothing$$
∅
: 4.1 mm) and a pure titanium rod ($$\varnothing$$
∅
: 4.0 mm) were exposed in a commercial CBCT (3D Accuitomo 170). The raw two-dimensional (2D) projection radiographs the CBCT utilizes for three-dimensional reconstruction applied for acquisition of attenuation profiles through the circular central slice of the implant-phantom images. Distances the x-rays traverse through the implant-phantoms at this location were computed. Using this information and the linear attenuation coefficient, transmission and attenuation was computed for each material and beam energy. These data were related to beam hardening artefacts that were assessed in the axial reconstructions of the implants’ CBCT images. Transmission of titanium for all peak kilovoltages (kVp) was higher and approximately 200% that of Y-TZP at 60 kVp versus 530% at 90 kVp. At 4 mm diameter transmission for Y-TZP was only approximately 5 % for all four beam-energies. In agreement with this finding, beam hardening artefacts for Y-TZP could not be reduced using higher energies, whereas for titanium they decreased with increasing energy. For the energy spectrum used in this study (60–90 kVp), beam hardening caused by titanium can be reduced using higher energies while this is not the case for zirconia-ceramic (Y-TZP).
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Pieralli S, Beyer C, Wesemann C, Vach K, Russe MF, Kernen F, Nelson K, Spies BC. Impact of radiographic field-of-view volume on alignment accuracy during virtual implant planning: A noninterventional retrospective pilot study. Clin Oral Implants Res 2022; 33:1021-1029. [PMID: 35861131 DOI: 10.1111/clr.13983] [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: 12/08/2021] [Revised: 06/13/2022] [Accepted: 06/22/2022] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To evaluate the impact of reducing the radiographic field-of-view (FOV) on the trueness and precision of the alignment between cone beam computed tomography (CBCT) and intraoral scanning data for implant planning. MATERIALS AND METHODS Fifteen participants presenting with one of three clinical scenarios: single tooth loss (ST, n=5), multiple missing teeth (MT, n=5), and presence of radiographic artifacts (AR, n=5) were included. CBCT volumes covering the full arch (FA) were reduced to the quadrant (Q) or the adjacent tooth/teeth (A). Two operators, an expert (exp) in virtual implant planning and an inexperienced clinician, performed multiple superimpositions, with FA-exp serving as a reference. The deviations were calculated at the implant apex and shoulder levels. Thereafter, linear mixed models were adapted to investigate the influence of FOV on discrepancies. RESULTS Evaluation of trueness compared to FA-exp resulted in the largest mean (AR-A: 0.10 ± 0.33 mm) and single maximum discrepancy (AR-Q: 1.44 mm) in the presence of artifacts. Furthermore, for the ST group, the largest mean error (-0.06 ± 0.2 mm, shoulder) was calculated with the FA-FOV, while for MT, with the intermediate volume (-0.07 ± 0.24 mm, Q). In terms of precision, the mean SD intervals were ≤0.25 mm (A-exp). Precision was influenced by FOV volume (FA<Q<A) but not by operator expertise. CONCLUSIONS For single posterior missing teeth, an extended FOV does not improve registration accuracy. However, in the presence of artifacts or multiple missing posterior teeth, caution is recommended when reducing FOV.
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Affiliation(s)
- Stefano Pieralli
- Medical Center - University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine - University of Freiburg, Freiburg, Germany
| | - Christoph Beyer
- Medical Center - University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine - University of Freiburg, Freiburg, Germany.,Medical Center - University of Freiburg, Center of Dental Medicine, Department of Oral and Maxillofacial Surgery, Faculty of Medicine - University of Freiburg, Freiburg, Germany
| | - Christian Wesemann
- Medical Center - University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine - University of Freiburg, Freiburg, Germany
| | - Kirstin Vach
- Medical Center - University of Freiburg, Institute for Medical Biometry and Statistics, Faculty of Medicine - University of Freiburg, Freiburg, Germany
| | - Maximilian Frederik Russe
- Medical Center - University of Freiburg, Department of Diagnostic and Interventional Radiology, Faculty of Medicine - University of Freiburg, Freiburg, Germany
| | - Florian Kernen
- Medical Center - University of Freiburg, Center of Dental Medicine, Department of Oral and Maxillofacial Surgery, Faculty of Medicine - University of Freiburg, Freiburg, Germany
| | - Katja Nelson
- Medical Center - University of Freiburg, Center of Dental Medicine, Department of Oral and Maxillofacial Surgery, Faculty of Medicine - University of Freiburg, Freiburg, Germany
| | - Benedikt Christopher Spies
- Medical Center - University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine - University of Freiburg, Freiburg, Germany
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