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El Bachaoui S, Verhelst PJ, de Faria Vasconcelos K, Shaheen E, Coucke W, Swennen G, Jacobs R, Politis C. The impact of CBCT-head tilting on 3D condylar segmentation reproducibility. Dentomaxillofac Radiol 2023; 52:20230072. [PMID: 37606052 PMCID: PMC10461261 DOI: 10.1259/dmfr.20230072] [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: 02/12/2023] [Revised: 06/26/2023] [Accepted: 06/29/2023] [Indexed: 08/23/2023] Open
Abstract
OBJECTIVES To investigate whether variations in head positioning may influence the reproducibility of cone-beam CT (CBCT) three-dimensional (3D) segmented models of the mandibular condyle. METHODS Five fresh frozen cadaver heads were scanned in four different positions: reference position (RP) and a set of three tilted alternative head positions (AP) in anteroposterior direction (AP1: 2 cm anterior translation, AP2: 5° pitch rotation, AP3: 10° pitch rotation). Surface models of mandibular condyles were constructed and compared with the condylar reference position using voxel-based registration. Descriptive statistics and a linear mixed-effects model were performed to compare condylar volumetric differences and root mean square (RMS) distance between surfaces of AP vs RP. RESULTS The mean differences in condylar volumes of AP vs RP were 14.1 mm³ (95% CI [-79.3, 107.4]) for AP1, 1.0 mm³ (95% CI [-87.2, 89.2]) for AP2 and 0.1 mm³ (95% CI [-88.3, 88.4]) for AP3. Mean and absolute volumetric differences did not exceed earlier reported intraoperator differences of 30 mm³. The RMS distance values obtained per group were 0.12 mm (95% CI [0.05,0.20]) for AP1, 0.17 mm (95% CI [0.10, 0.22]) for AP2 and 0.17 mm for AP3 (95% CI [0.10,0.22]). The confidence intervals (CI) for RMS distance remained far below the threshold for clinical acceptability (0.5 mm). CONCLUSIONS Within the limits of the present study, it is suggested that tilted head positions may affect the reproducibility of 3D condylar segmentation, thereby influencing outcome in repeated CBCT scanning. Nevertheless, observed differences are unlikely to have a meaningful impact on clinical patient diagnosis and management.
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Affiliation(s)
| | | | | | | | - Wim Coucke
- Certified Freelance Statistician, Heverlee, Belgium
| | - Gwen Swennen
- Division of Maxillofacial Surgery, AZ Sint-Jan Brugge-Oostende AV, Brugge, Belgium
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Kim YH, Jung BY, Han SS, Woo CW. Accuracy evaluation of 3D printed interim prosthesis fabrication using a CBCT scanning based digital model. PLoS One 2020; 15:e0240508. [PMID: 33064731 PMCID: PMC7567388 DOI: 10.1371/journal.pone.0240508] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 09/29/2020] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVES This study aimed to evaluate the marginal and internal gaps in 3D-printed interim crowns made from digital models of cone-beam computed tomography (CBCT) conversion data. MATERIALS AND METHODS Sixteen polyvinylsiloxane impressions were taken from patients for single crown restorations and were scanned using CBCT. The scanning data were converted to positive Standard Triangulation Language (STL) files using custom-developed software. The fabricated stone models were scanned with an intraoral optical scanner (IOS) to compare the surface accuracy with the STL data obtained by CBCT. The converted STL files were utilized to fabricate interim crowns with a photopolymer using a digital light-processing 3D printer. The replica method was used to analyze the accuracy. The marginal and internal gaps in the replica specimen of each interim crown were measured with a digital microscope. The Friedman test and Mann-Whitney U test (Wilcoxon-signed rank test) were conducted to compare the measurements of the marginal and internal gaps with a 95% level of confidence. RESULTS The root-mean-square values of the CBCT and IOS ranged from 41.00 to 126.60 μm, and the mean was 60.12 μm. The mean values of the marginal, internal, and total gaps were 132.96 (±139.23) μm, 137.86 (±103.09) μm, and 135.68 (±120.30) μm, respectively. There were no statistically significant differences in the marginal or internal gaps between the mesiodistal and buccolingual surfaces, but the marginal area (132.96 μm) and occlusal area (255.88 μm) had significant mean differences. CONCLUSION The marginal gap of the fabricated interim crowns based on CBCT STL data was within the acceptable range of clinical success. Through ongoing developments of high-resolution CBCT and the digital model conversion technique, CBCT might be an alternative method to acquire digital models for interim crown fabrication.
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Affiliation(s)
- Young Hyun Kim
- Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, Seoul, Korea
| | - Bock-Young Jung
- Department of Advanced General Dentistry, Yonsei University College of Dentistry, Seoul, Korea
| | - Sang-Sun Han
- Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, Seoul, Korea
| | - Chang-Woo Woo
- Central Dental Laboratory, Dental Hospital of Yonsei University, Seoul, Korea
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Friedli L, Kloukos D, Kanavakis G, Halazonetis D, Gkantidis N. The effect of threshold level on bone segmentation of cranial base structures from CT and CBCT images. Sci Rep 2020; 10:7361. [PMID: 32355261 PMCID: PMC7193643 DOI: 10.1038/s41598-020-64383-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 04/16/2020] [Indexed: 11/15/2022] Open
Abstract
The use of a single grey intensity threshold is one of the most straightforward and widely used methods to segment cranial base surface models from a 3D radiographic volume. In this study we used thirty Cone Beam Computer Tomography (CBCT) scans from three different machines and ten CT scans of growing individuals to test the effect of thresholding on the subsequently produced anterior cranial base surface models. From each scan, six surface models were generated using a range of voxel intensity thresholds. The models were then superimposed on a manually selected reference surface model, using an iterative closest point algorithm. Multivariate tests showed significant effects of the machine type, threshold value, and superimposition on the spatial position and the form of the created models. For both, CT and CBCT machines, the distance between the models, as well as the variation within each threshold category, was consistently increasing with the magnitude of difference between thresholds. The present findings highlight the importance of accurate anterior cranial base segmentation for reliable assessment of craniofacial morphology through surface superimposition or similar methods that utilize this anatomical structure as reference.
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Affiliation(s)
- Luca Friedli
- Department of Orthodontics and Dentofacial Orthopedics, University of Bern, CH-3010, Bern, Switzerland
| | - Dimitrios Kloukos
- Department of Orthodontics and Dentofacial Orthopedics, University of Bern, CH-3010, Bern, Switzerland.,Department of Orthodontics and Dentofacial Orthopedics, 251 Hellenic Air Force General Hospital, GR-11525, Athens, Greece
| | - Georgios Kanavakis
- Department of Pediatric Oral Health and Orthodontics, University Center for Dental Medicine - UZB, University of Basel, CH-4058, Basel, Switzerland
| | - Demetrios Halazonetis
- Department of Orthodontics, School of Dentistry, National and Kapodistrian University of Athens, GR-11527, Athens, Greece
| | - Nikolaos Gkantidis
- Department of Orthodontics and Dentofacial Orthopedics, University of Bern, CH-3010, Bern, Switzerland.
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Bayrak S, Kursun Cakmak ES, Kamalak H. Contrast-to-noise ratios of different dental restorative materials: an in-vitro cone beam computed tomography study. Eur Oral Res 2020; 54:36-41. [PMID: 32518909 PMCID: PMC7252535 DOI: 10.26650/eor.20200079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Purpose In radiological views, strong beam hardening and streaking artifacts occur due to high-density structures and polyenergetic X-ray beams, and these lead to misdiagnosis. This study was performed in vitro to compare the contrast-to-noise ratio (CNR) of commonly used dental restorative materials by using Cone Beam Computed Tomography (CBCT) images with and without artifact reduction (AR) mode. Materials and methods A total of 108 molar teeth were restored with nine different groups of restorative materials, with each group containing 12 teeth. Teeth were placed in a dry human mandible and scanned, one by one, via Planmeca 3D ProMax (Planmeca, Helsinki, Finland) with and without AR mode. Images were analyzed using ImageJ software (National Institutes of Health, Bethesda, MD) to calculate the CNR. Results CNR was calculated to be the highest in compomer (Glassiosite) images without AR mode (mean: 3.36) and with AR mode (mean: 3.61). CNR was calculated to be the lowest in amalgam (Tytin) images without AR mode (mean: 0.21) and with AR mode (mean: 0.23). A significant difference was found between materials in terms of CNR measurements (p ≤ 0.05). CNR measurements were increased after the AR mode application (p ≤ 0.05). Conclusion AR mode was effective in reducing artifacts arising from dental materials on CBCT images, so it is necessary to use AR mode for correct diagnoses.
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Affiliation(s)
- Seval Bayrak
- Abant İzzet Baysal University, Dentistry Faculty,Dentomaxillofacial Radiology Department, Bolu,Turkey
| | | | - Hakan Kamalak
- Kahramanmaras Sütcü İmam University, Dentistry Faculty, Department of Restorative Dentistry, Kahramanmaras,Turkey
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Santaella GM, Rosalen PL, Queiroz PM, Haiter-Neto F, Wenzel A, Spin-Neto R. Quantitative assessment of variation in CBCT image technical parameters related to CBCT detector lateral-offset position. Dentomaxillofac Radiol 2019; 49:20190077. [PMID: 31469317 DOI: 10.1259/dmfr.20190077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
OBJECTIVES To assess the effect of CBCT detector position (aligned/lateral-offset) on image technical parameters (mean voxel value - MVV, standard deviation of voxel value (SDVV) distribution), comparing peripheral regions of interest (ROIs) to the central ROI in CBCT volumes. METHODS 40 CBCT volumes of a wax phantom were acquired in six units with aligned and/or lateral-offset detectors: Cranex 3Dx (CRA), Ortophos SL (ORT), Picasso Trio (PIC), Promax 3D Mid (PRO), Scanora 3D (SCA), and X1. Four image-acquisition protocols used an aligned detector, and four a lateral-offset detector. In each volume, 13 ROIs (12 peripheral and 1 central) were evaluated. MVV and SDVV of the peripheral ROI were compared to those of the central ROI in the volume. MVVD (the difference in percentage, between the MVV of a peripheral and the central ROI) was calculated. RESULTS For aligned-detectors, MVV increased (ORT and PRO) or decreased (CRA and X1) in the ROIs farther from the centre. For lateral-offset detectors, ROIs farther from the centre showed increased MVV. SDVV for most aligned detectors was lower, the nearer the ROI was to the centre. For lateral-offset detectors, it was lower for the peripheral ROIs, except with PIC. Range for MVVD was -32.8% to 22.8% for units with aligned detectors, and -20.7% to 69.5% for lateral-offset detectors. CONCLUSION Lateral-offset detectors to acquire CBCT images significantly change SDVV distribution within the field-of-view, and lead to MVVD with increased range, compared to aligned detectors. This must be taken in consideration in the clinic, if voxel-value dependent measurements are to be performed.
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Affiliation(s)
- Gustavo Machado Santaella
- Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Sao Paulo, Brazil
| | - Pedro Luiz Rosalen
- Department of Physiological Sciences, Area of Pharmacology, Piracicaba Dental School, University of Campinas, Piracicaba, Sao Paulo, Brazil
| | - Polyane Mazucatto Queiroz
- Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Sao Paulo, Brazil
| | - Francisco Haiter-Neto
- Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Sao Paulo, Brazil
| | - Ann Wenzel
- Department of Dentistry and Oral Health, Section of Oral Radiology, Aarhus University, Denmark, Europe
| | - Rubens Spin-Neto
- Department of Dentistry and Oral Health, Section of Oral Radiology, Aarhus University, Denmark, Europe
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Stamatakis HC, Steegman R, Dusseldorp J, Ren Y. Head positioning in a cone beam computed tomography unit and the effect on accuracy of the three-dimensional surface mode. Eur J Oral Sci 2018; 127:72-80. [DOI: 10.1111/eos.12582] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2018] [Indexed: 11/28/2022]
Affiliation(s)
- Harry C. Stamatakis
- Department of Orthodontics; University of Groningen; University Medical Centre Groningen; Groningen the Netherlands
| | - Ralph Steegman
- Department of Orthodontics; University of Groningen; University Medical Centre Groningen; Groningen the Netherlands
| | - Joost Dusseldorp
- Department of Orthodontics; University of Groningen; University Medical Centre Groningen; Groningen the Netherlands
| | - Yijin Ren
- Department of Orthodontics, W. J. Kolff Institute of Biomedical Engineering and Materials Science; University of Groningen; University Medical Centre Groningen; Groningen the Netherlands
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Genisa M, Shuib S, Rajion ZA, Arief EM, Hermana M. Density estimation based on the Hounsfield unit value of cone beam computed tomography imaging of the jawbone system. Proc Inst Mech Eng H 2018; 232:954411918806333. [PMID: 30309283 DOI: 10.1177/0954411918806333] [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] [Indexed: 11/15/2022]
Abstract
The aim of this study is to investigate the estimation of density from the Hounsfield unit of cone beam computed tomography data in dental imaging, especially for dental implant application. A jaw phantom with various known densities of anatomical parts (e.g. soft tissue, cortical bone, trabecular bone, tooth enamel, tooth dentin, sinus cavity, spinal cord and spinal disc) has been used to test the accuracy of the Hounsfield unit of cone beam computed tomography in estimating the mechanical density (true density). The Hounsfield unit of cone beam computed tomography data was evaluated via the MIMICS software using both two-dimensional and three-dimensional methods, and the results showed correlation with the true density of the object. In addition, the results revealed that the Hounsfield unit of cone beam computed tomography and bone density had a logarithmic relation, rather than a linear one. To this end, the correlation coefficient of logarithmic correlation (R2 = 0.95) is higher than the linear one (R2 = 0.77).
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Affiliation(s)
- Maya Genisa
- 1 Medical Faculty of YARSI University, Jakarta, Indonesia
| | - Solehuddin Shuib
- 2 Faculty of Mechanical Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia
| | - Zainul Ahmad Rajion
- 3 School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kota Bharu, Malaysia
| | - Erry Mochamad Arief
- 3 School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kota Bharu, Malaysia
| | - Maman Hermana
- 4 Universiti Teknologi PETRONAS, Seri Iskandar, Malaysia
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Panjnoush M, Kheirandish Y, Zeini N. Effect of Spatial Position in the Field of View on Dimensional Changes in Cone Beam Computed Tomography. JOURNAL OF DENTISTRY (TEHRAN, IRAN) 2017; 14:282-291. [PMID: 29296114 PMCID: PMC5748456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 08/20/2017] [Indexed: 06/07/2023]
Abstract
OBJECTIVES This study aimed to assess the relation between dimensional changes and object location in the field of view (FOV) using cone beam computed tomography (CBCT). MATERIALS AND METHODS A custom-made phantom was fabricated from base plate wax. To analyze the accuracy of measurements in horizontal and longitudinal dimensions, aluminum squares (0.5 mm thickness, 10×10 mm dimensions) were constructed and placed in three levels (upper, middle, and lower) and five positions (central, right, left, anterior and posterior). This phantom was scanned using Asahi, Planmeca and NewTom CBCT systems. CBCT scans were measured three times by use of their corresponding software. Statistical analysis was performed using one-way ANOVA, post-hoc test and two-way ANOVA (P<0.05). RESULTS The differences between the mean horizontal dimensions of different systems were not significant (P=0.296). However, the differences between the mean longitudinal dimensions of different systems were significant (P=0.039). The differences between the different positions and the mean horizontal and longitudinal dimensions were significant (P<0.001, and P<0.001, respectively). The differences between the mean horizontal dimensions and different levels were not significant (P=0.51), but the differences between the mean longitudinal dimensions and different levels were significant (P<0.001). The interaction effect of level and position on the accuracy of horizontal and longitudinal measurements was significant (P<0.0001). CONCLUSIONS We found statistically significant differences in most of our comparisons; however, these differences were not clinically significant. Therefore, CBCT could be an accurate device for measurement of dimensions of objects placed in different positions in the FOV.
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Affiliation(s)
- Mehrdad Panjnoush
- Associate Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Oral and Maxillofacial Radiology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Yasaman Kheirandish
- Assistant Professor, Department of Oral and Maxillofacial Radiology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Negar Zeini
- Postgraduate Student, Department of Oral and Maxillofacial Radiology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
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