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Lucca LV, Cascante-Sequeira D, Coelho-Silva F, Ruiz-Imbert AC, Freitas DQ, Haiter-Neto F, de-Azevedo-Vaz SL. The effect of voxel and field of view size on the volumetric alteration artifact of high-density materials with 2 cone beam computed tomography devices. Oral Surg Oral Med Oral Pathol Oral Radiol 2024; 137:290-300. [PMID: 37980244 DOI: 10.1016/j.oooo.2023.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 09/28/2023] [Accepted: 10/07/2023] [Indexed: 11/20/2023]
Abstract
OBJECTIVE We investigated the influence of voxel and field of view (FOV) sizes on expression of the volumetric alteration artifact (VAA) of 5 high-density materials in 2 cone beam computed tomography (CBCT) devices. STUDY DESIGN Cylinders of amalgam, cobalt-chromium, gutta-percha, titanium, and zirconium were individually positioned in a polymethyl methacrylate phantom. OP300 Maxio and ProMax 3D Classic CBCT devices were used to acquire images with varying voxel and FOV sizes, totaling 585 scans. Two evaluators segmented the high-density cylinder images to obtain the tomographic volumes. The difference between the tomographic and physical volume of each cylinder (i.e., volumetric alteration) was calculated. Statistical analysis was conducted with multiway ANOVA and the Tukey post hoc test (α = 5%). Evaluator reliability was measured with the intraclass correlation coefficient (ICC). RESULTS All studied parameters and nearly all interactions influenced the VAA (P < .05). The post hoc test demonstrated less volumetric alteration for the smallest voxel sizes, 61 × 78 mm FOV, and gutta-percha for OP300, and for the smallest voxel sizes, 80 × 80 mm FOV, and gutta-percha and titanium for ProMax 3D (P < .05). The ICC demonstrated perfect reliability (1.00). CONCLUSIONS Voxel and FOV sizes influenced VAA expression. Using smaller voxel sizes, the 61 × 78 mm FOV for OP300 and the 80 × 80 mm FOV for ProMax 3D, and materials with lower density and lower atomic number reduced VAA expression.
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Affiliation(s)
- Luiza Valdemarca Lucca
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.
| | - Deivi Cascante-Sequeira
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Fernanda Coelho-Silva
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Ana Cecilia Ruiz-Imbert
- Department of Diagnostic Sciences, Oral Radiology Section, Dentistry Faculty, Universidad de Costa Rica, San José, Costa Rica
| | - Deborah Queiroz Freitas
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Francisco Haiter-Neto
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil; Department of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo, Brazil
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Braga MS, de Almeida Ramos AM, Coelho-Silva F, Bonadiman EA, Pereira TCR, de-Azevedo-Vaz SL. Impact of enhancement filters of a CMOS system on halo artifact expression at the bone-to-implant interface. Clin Oral Investig 2024; 28:161. [PMID: 38381269 DOI: 10.1007/s00784-024-05553-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Accepted: 02/10/2024] [Indexed: 02/22/2024]
Abstract
OBJECTIVE To assess the impact of enhancement filters on the formation of halo artifacts in radiographs of dental implants obtained with a complementary metal oxide semiconductor (CMOS) system. METHODS Digital radiographs of dental implants placed in dry human mandibles were processed with the Noise Reduction smoothing filter, as well as the Sharpen 1, Sharpen 4, and Sharpen UM high-pass filters available in the CLINIVIEW™ software (Instrumentarium Dental, Tuusula, Finland). Subjective analysis involved evaluating the left, right, and apical surfaces of each implant for the presence of much, few, or no halo. The objective analysis involved measurement of the halo area using the Trainable Weka Segmentation plugin (ImageJ, National Institutes of Health, Bethesda, MD, USA). Data were analyzed using Friedman's test (subjective analysis) and ANOVA (objective analysis) (α = 5%). RESULTS In the subjective evaluation, the Sharpen 4 filter produced more radiographs with much halo present, and in the objective evaluation, a bigger halo area when compared to the original images and the Noise Reduction filter for all surfaces (p < 0.05). CONCLUSIONS When evaluating dental implants, priority should be given to original images and those enhanced with smoothing filters since they exhibit fewer halo artifacts. CLINICAL RELEVANCE Post-processing tools, such as enhancement filters, may improve the image quality and assist some diagnostic tasks. However, little is known regarding the impact of enhancement filters in halo formation on CMOS systems, which have been increasingly used in dental offices.
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Affiliation(s)
| | | | - Fernanda Coelho-Silva
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Eduarda Alberti Bonadiman
- Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Av. Marechal Campos 1468, Maruípe, Vitória, Espírito Santo, 29043900, Brazil
| | | | - Sergio Lins de-Azevedo-Vaz
- Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Av. Marechal Campos 1468, Maruípe, Vitória, Espírito Santo, 29043900, Brazil.
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Coelho-Silva F, Cascante-Sequeira D, Réa MT, Oliveira ML, Freitas DQ, Haiter-Neto F, de-Azevedo-Vaz SL. High-density objects in exomass affect the volume of high-density objects inside the field of view. Dentomaxillofac Radiol 2024; 53:153-160. [PMID: 38224272 DOI: 10.1093/dmfr/twad014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 12/04/2023] [Accepted: 12/11/2023] [Indexed: 01/16/2024] Open
Abstract
OBJECTIVES To evaluate the effect of the presence and the number of high-density objects in the exomass on the volume of a high-density object in cone-beam CT (CBCT). METHODS Cylinders of cobalt-chromium (Co-Cr), titanium (Ti), and zirconium (Zi) were inserted into a polymethylmethacrylate phantom in five different combinations of number and position: 1-no cylinder; 2-one cylinder in a posterior region; 3-one cylinder in an anterior region; 4-two cylinders in posterior regions; and 5-three cylinders in anterior and posterior regions. The phantom underwent CBCT scanning using OP300 and X800 systems, with the afore mentioned cylinders of the same composition placed in the exomass and an additional high-density cylinder placed in the centre of the field of view (FOV), corresponding to the left-anterior region. The tomographic volume of the cylinder inside the FOV was measured using semi-automatic segmentation. The volumetric alteration (VA) between the segmented and physical volumes, in percentage, was compared among the experimental groups using repeated measures ANOVA and Tukey post-hoc (α = 5%). RESULTS The factors material, combination, and their interaction affected the volume or both CBCT systems. In OP300, more cylinders in the exomass reduced the VA, mainly for Co-Cr. In X800, more cylinders in the exomass tended to increase the VA inside the FOV, except for Zi. CONCLUSIONS In general, the presence of high-density objects in the exomass influences the VA of the object inside the FOV, although this oscillates according to object composition, number and position in the exomass, and CBCT system.
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Affiliation(s)
- Fernanda Coelho-Silva
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba 13414-903, Brazil
| | - Deivi Cascante-Sequeira
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba 13414-903, Brazil
| | - Marcela Tarosso Réa
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba 13414-903, Brazil
| | - Matheus L Oliveira
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba 13414-903, Brazil
| | - Deborah Queiroz Freitas
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba 13414-903, Brazil
| | - Francisco Haiter-Neto
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba 13414-903, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba 13414-903, Brazil
- Department of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo 29075-910, Brazil
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Cascante-Sequeira D, Coelho-Silva F, Lopes Rosado LP, Lucca LV, Queiroz Freitas D, Lins de-Azevedo-Vaz S, Haiter-Neto F. Does cone-beam CT convex triangular field of view influence the image shape distortion of high-density materials? Dentomaxillofac Radiol 2023; 52:20230029. [PMID: 37427699 DOI: 10.1259/dmfr.20230029] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2023] Open
Abstract
OBJECTIVES To assess the distortion of high-density materials using two CBCT devices presenting convex triangular and cylindrical fields of view (FOVs). METHODS AND MATERIALS Four high-density cylinders were individually placed in a polymethylmethacrylate phantom. 192 CBCT scans were acquired using the convex triangular and cylindrical FOVs of Veraviewepocs® R100 (R100) and Veraview® X800 (X800) devices. Using HorosTM's software, two oral radiologists determined the cylinders' horizontal and vertical dimensional alterations. Nine oral radiologists subjectively identified each cylinder's axial shape distortion. Statistical analysis comprised Multiway ANOVA (α = 5%), and the Kruskal-Wallis test. RESULTS The distortion in the axial plane was greater in the convex triangular FOVs for both devices in almost all the materials (p < 0.05). The evaluators subjectively identified a shape distortion in both FOVs for R100 device (p < 0.001), while no distortion was identified for X800 device (p = 0.620). A vertical magnification of all materials was observed in both FOVs for both devices (p < 0.05). No differences among vertical regions (p = 0.988) nor FOVs (p = 0.544) were found for the R100 device, while all materials showed higher magnification in all regions in the cylindrical FOV (p < 0.001) of the X800 device. CONCLUSIONS The convex triangular FOV influenced the axial distortion of the high-density materials in both devices. A vertical magnification was observed in both FOVs of both devices, but it was greater in the cylindrical FOV of the X800 device.
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Affiliation(s)
- Deivi Cascante-Sequeira
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Fernanda Coelho-Silva
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
- Department of Surgery, Division of Oral Radiology, São Paulo State University (Unesp), School of Dentistry, Araçatuba, Brazil
| | - Lucas P Lopes Rosado
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
- Department of Dentistry, University Center of Espírito Santo (UNESC), Colatina, Espírito Santo, Brazil
| | - Luiza Valdemarca Lucca
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Deborah Queiroz Freitas
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
- Department of Clinical Dentistry, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Francisco Haiter-Neto
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
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Jindanil T, Marinho-Vieira LE, de-Azevedo-Vaz SL, Jacobs R. A unique artificial intelligence-based tool for automated CBCT segmentation of mandibular incisive canal. Dentomaxillofac Radiol 2023; 52:20230321. [PMID: 37870152 DOI: 10.1259/dmfr.20230321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2023] Open
Abstract
OBJECTIVES To develop and validate a novel artificial intelligence (AI) tool for automated segmentation of mandibular incisive canal on cone beam computed tomography (CBCT) scans. METHODS After ethical approval, a data set of 200 CBCT scans were selected and categorized into training (160), validation (20), and test (20) sets. CBCT scans were imported into Virtual Patient Creator and ground truth for training and validation were manually segmented by three oral radiologists in multiplanar reconstructions. Intra- and interobserver analysis for human segmentation variability was performed on 20% of the data set. Segmentations were imported into Mimics for standardization. Resulting files were imported to 3-Matic for analysis using surface- and voxel-based methods. Evaluation metrics involved time efficiency, analysis metrics including Dice Similarity Coefficient (DSC), Intersection over Union (IoU), Root mean square error (RMSE), precision, recall, accuracy, and consistency. These values were calculated considering AI-based segmentation and refined-AI segmentation compared to manual segmentation. RESULTS Average time for AI-based segmentation, refined-AI segmentation and manual segmentation was 00:10, 08:09, and 47:18 (284-fold time reduction). AI-based segmentation showed mean values of DSC 0.873, IoU 0.775, RMSE 0.256 mm, precision 0.837 and recall 0.890 while refined-AI segmentation provided DSC 0.876, IoU 0.781, RMSE 0.267 mm, precision 0. 852 and recall 0.902 with the accuracy of 0.998 for both methods. The consistency was one for AI-based segmentation and 0.910 for manual segmentation. CONCLUSIONS An innovative AI-tool for automated segmentation of mandibular incisive canal on CBCT scans was proofed to be accurate, time efficient, and highly consistent, serving pre-surgical planning.
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Affiliation(s)
- Thanatchaporn Jindanil
- Department of Imaging and Pathology, Faculty of Medicine, OMFS-IMPATH Research Group, KU Leuven, Leuven, Belgium
| | - Luiz Eduardo Marinho-Vieira
- Department of Imaging and Pathology, Faculty of Medicine, OMFS-IMPATH Research Group, KU Leuven, Leuven, Belgium
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | | | - Reinhilde Jacobs
- Department of Imaging and Pathology, Faculty of Medicine, OMFS-IMPATH Research Group, KU Leuven, Leuven, Belgium
- Department of Dental Medicine, Karolinska Institute, Stockholm, Sweden
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de Oliveira Mota VP, Braga MS, Loss AA, Mello HN, Rosetti EP, de-Azevedo-Vaz SL. Detection of misfits at the abutment-prosthesis interface in the esthetic zone: Implications of the radiographic technique and the magnitude of the misfit. J Prosthet Dent 2023; 130:239.e1-239.e9. [PMID: 37455164 DOI: 10.1016/j.prosdent.2023.05.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 07/18/2023]
Abstract
STATEMENT OF PROBLEM Misfits in the abutment-prosthesis interface represent a setback for implant-supported prostheses. Periapical radiographs have been used as an auxiliary method in the evaluation of prosthesis fit to the abutments; however, the evidence supporting the use of this method is still restricted to studies of low to moderate quality. Furthermore, studies on the diagnostic accuracy of different periapical techniques used to detect misfits in the abutment-prosthesis interface, especially in the esthetic zone, are lacking. PURPOSE The purpose of this in vitro study was to assess the discrimination power of 3 periapical radiographic techniques in detecting misfits at the abutment-prosthesis interface in the esthetic zone and evaluate whether the magnitude of the misfit influenced the diagnosis. MATERIAL AND METHODS A total of 15 implants with an internal conical connection were installed in the central incisor region in polyamide jaws. Custom ceramic copings for cemented crowns were made by using a computer-aided design and computer-aided manufacturing (CAD-CAM) system. Misfits of 50, 100, and 150 µm were simulated by interposing 1, 2, or 3 50-μm-thick polyester strips at the abutment-prosthesis interface; the absence of the strip represented the control group. Digital radiographs were obtained by using film holders for the following periapical techniques: bisecting angle (PBA), standard paralleling (PSP), and modified paralleling (PMP). Two radiologists and 1 prosthodontist evaluated a total of 180 radiographs. The values of the area under the receiver operating characteristic curve (Az) were regarded as a measure of diagnostic accuracy and subjected to the Friedman test with post hoc Durbin-Conover (α=.05). RESULTS The PSP (Az=0.873) had higher Az values than the PBA (Az=0.753) for the 50-μm misfits (P<.05). Larger misfits resulted in greater accuracy than smaller misfits (P<.05). Interactions between the factors radiographic technique and misfit magnitude resulted in statistically significant differences for all comparisons (P<.05), except between the PSP for the 100-μm misfits (Az=0.976) and the PMP for the 150-μm misfits (Az=0.998). CONCLUSIONS The PSP was more accurate than the PBA in detecting the 50-µm misfits at the abutment-prosthesis interface; larger misfits resulted in more accurate diagnoses, regardless of the technique used.
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Affiliation(s)
- Vanessa Pacheco de Oliveira Mota
- Graduate student, Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil
| | - Manuella Soussa Braga
- Undergraduate student, Department of Clinical Dentistry, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil
| | - Amanda Alves Loss
- Undergraduate student, Department of Clinical Dentistry, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil
| | - Hugo Nogueira Mello
- Graduate student, Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil
| | - Elizabeth Pimentel Rosetti
- Professor, Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Professor, Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil.
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Mouzinho-Machado S, Borges GB, Pacheco-de-Oliveira-Mota V, de-Azevedo-Vaz SL. Does enhancement filter application increase the diagnostic accuracy of misfit detection at the implant-prosthesis interface? J Prosthet Dent 2022:S0022-3913(22)00215-3. [PMID: 35570168 DOI: 10.1016/j.prosdent.2022.03.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM Misfits at the implant-prosthesis interface may increase complications in dental implants and affect peri-implant tissue health. Periapical radiographs are the most used imaging examinations for detecting misfits at the implant-prosthesis interface, although digital systems have largely replaced film-based radiographs. Whether postprocessing tools such as enhancement filters assist diagnosis by highlighting misfits is unclear. PURPOSE The purpose of this in vitro study was to assess the influence of enhancement filter application in the diagnostic accuracy of misfit detection at the implant-prosthesis interface. MATERIAL AND METHODS A total of 32 dental implants were placed in dry human mandibles. A polyester strip was inserted at the implant-prosthesis interface to simulate a 50-μm misfit; prosthetic crowns installed directly on the implant platforms were used as controls. Standard paralleling periapical images were acquired by using a semidirect system (photostimulable phosphor plate) with the application of Highlight, Invert, and Colorization filters, as well as a direct system (metal oxide complementary semiconductor sensor) with filters Sharpness 3, Invert, and Pseudocolorization. Oral radiologists evaluated the images with and without the application of filters. The areas under the receiver operating characteristics curves (Az values), sensitivity, specificity, accuracy, positive predictive value, and negative predictive values were calculated. The Az values were compared with the receiver operating characteristic (ROC) curves comparison test of the Epidat 3.1 software (α=.05). RESULTS Although images without filter application presented descriptively higher diagnostic values than those with filter application, the Az values for images with and without filter application in both semidirect and direct systems showed no significant differences (P>.05). CONCLUSIONS Enhancement filter application did not significantly influence the diagnostic accuracy of misfit detection at the implant-prosthesis interface.
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Affiliation(s)
- Sâmia Mouzinho-Machado
- Graduate student, Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil
| | - Gustavo Bispo Borges
- Predoctoral student, Department of Clinical Dentistry, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil
| | - Vanessa Pacheco-de-Oliveira-Mota
- Graduate student, Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Professor, Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil.
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Cascante-Sequeira D, Coelho-Silva F, Rosado LPL, Freitas DQ, de-Azevedo-Vaz SL, Haiter-Neto F. Comparison of the expression of the volumetric alteration artifact in cylindrical and triangular fields of view in two cone-beam computed tomography devices. Clin Oral Investig 2021; 26:1025-1033. [PMID: 34324084 DOI: 10.1007/s00784-021-04086-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 07/17/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To compare the expression of the volumetric alteration (VA) artifact between cylindrical and convex triangular fields of view (FOVs) using high-density materials in different positions in two cone-beam computed tomography (CBCT) devices. MATERIALS AND METHODS Cylinders of five high-density materials (amalgam, chromium-cobalt, gutta-percha, titanium, and zirconium) with known physical volume were individually submitted to CBCT acquisition in four positions inside a polymethylmethacrylate phantom using two different FOV shapes (convex triangular and cylindrical) on the Veraviewepocs® R100 (R100) and Veraview® X800 (X800) devices. Two oral radiologists obtained the tomographic volumes by segmenting each cylinder. The difference between the tomographic and physical volumes corresponded to the VA. These values were analyzed by intraclass correlation coefficient and analysis of variance for repeated measures with Tukey post hoc test (α = 5%). RESULTS The FOV influenced the VA only in the X800 device (p = 0.014): the VA in the triangular FOV was greater than in the cylindrical FOV. The VA in the triangular FOV of the X800 device was greater than the R100 device (p < 0.0001). The material influenced the expression of the VA only in the R100 device (p < 0.0001); gutta-percha presented the highest VA, being underestimated, and differing from the other materials (p < 0.01). CONCLUSION The triangular FOV increased the VA of high-density materials in the X800 device. CLINICAL RELEVANCE It is important to know if there is an influence on the volumetric alteration artifact of dental materials due to the different image formation geometry in the convex triangular FOV.
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Affiliation(s)
- Deivi Cascante-Sequeira
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, PO Box 52, Piracicaba, SP, 13414-903, Brazil.
| | - Fernanda Coelho-Silva
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, PO Box 52, Piracicaba, SP, 13414-903, Brazil
| | - Lucas P Lopes Rosado
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, PO Box 52, Piracicaba, SP, 13414-903, Brazil
| | - Deborah Queiroz Freitas
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, PO Box 52, Piracicaba, SP, 13414-903, Brazil
| | | | - Francisco Haiter-Neto
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, PO Box 52, Piracicaba, SP, 13414-903, Brazil
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Mouzinho-Machado S, Rosado LDPL, Coelho-Silva F, Neves FS, Haiter-Neto F, de-Azevedo-Vaz SL. Influence of Voxel Size and Filter Application in Detecting Second Mesiobuccal Canals in Cone-beam Computed Tomographic Images. J Endod 2021; 47:1391-1397. [PMID: 34166686 DOI: 10.1016/j.joen.2021.06.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 05/26/2021] [Accepted: 06/14/2021] [Indexed: 11/27/2022]
Abstract
INTRODUCTION This study assessed the influence of voxel size and filter application in detecting second mesiobuccal (MB2) canals in cone-beam computed tomographic (CBCT) images. METHODS Using the OP300 CBCT system (Instrumentarium, Tuusula, Finland) and 3 voxel size protocols (80 μm, 125 μm, and 200 μm), we scanned 40 first molars: 20 with an MB2 canal and 20 without. All molars received silver palladium pins on the palatal root, whereas the non-MB2 molars were also filled with gutta-percha. Five oral radiologists assessed the presence of an MB2 canal under 3 filter application conditions: without filter, with sharpen 1 × filter, and with sharpen 2 × filter. Intra- and interobserver reproducibility was evaluated using the weighted kappa index. We compared the area under the receiver operating characteristic curves with SPSS Statistics v.20.0 (IBM Corp, Armonk, NY) using 2-way analysis of variance and the Tukey post hoc test with 5% significance level. RESULTS Our analysis found median intra- and interobserver agreement values of 0.70 and 0.56, respectively. The 80-μm voxel with sharpen 1 × filter image group had the highest sensitivity, accuracy, and negative predictive values. As for specificity and positive predictive, the 80-μm voxel group without filter application presented the highest values. The areas under the receiver operating characteristic curve were higher in the 80-μm groups than in the 125-μm and 200-μm voxel size groups (P < .05). We found no differences among the filters used (P = .22) or for the filter-voxel size interactions (P = .88). CONCLUSIONS A smaller voxel size increased the accuracy in detecting MB2 canals, whereas the enhancement filters did not.
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Affiliation(s)
- Sâmia Mouzinho-Machado
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Lucas de Paula Lopes Rosado
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Fernanda Coelho-Silva
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Frederico Sampaio Neves
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil; Division of Oral Radiology, Department of Propedeutics and Integrated Clinic, Federal University of Bahia, Salvador, Bahia, Brazil
| | - Francisco Haiter-Neto
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil; Department of Clinical Dentistry, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil.
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Coelho-Silva F, Gaêta-Araujo H, Rosado LPL, Freitas DQ, Haiter-Neto F, de-Azevedo-Vaz SL. Distortion or magnification? An in vitro cone-beam CT study of dimensional changes of objects with different compositions. Dentomaxillofac Radiol 2021; 50:20210063. [PMID: 34111368 DOI: 10.1259/dmfr.20210063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES To assess whether dimensional changes occur as shape distortion (unevenly), contraction or magnification (evenly) in cone beam computed tomography (CBCT) considering materials, anatomical regions and metal artefact reduction algorithms. METHODS Four cylinders of amalgam (Am), cobalt-chromium (Co-Cr), gutta-percha (Gu), titanium (Ti) and zirconium (Zi) were inserted inside a polymethylmethacrylate phantom in anterior and posterior regions for acquisitions in Picasso Trio and OP300 with MAR enabled and disabled. Two observers measured the dimensions of each cylinder in three axes: Y (height), Z (antero posterior diameter) and X (latero-lateral diameter). Repeated measures ANOVA with Tukey post-hoc test compared the data (α = 5%). RESULTS Shape distortion occurred for all materials in anterior region of Picasso Trio without MAR (p < 0.05). With MAR enabled, Gu and Ti contracted (p ≥ 0.05), while the others showed distortion (p < 0.05). In posterior region, all materials distorted in both MAR conditions (p < 0.05), except Gu, which magnified without MAR (p ≥ 0.05) and contracted unevenly with MAR (p < 0.05). In anterior region of OP300, all materials magnified without MAR, (p ≥ 0.05) and had shape distortion with MAR (p < 0.05). In posterior region, only Am showed magnification without MAR (p ≥ 0.05), while all materials presented shape distortion with MAR (p < 0.05). CONCLUSION Dimensional changes of high-density materials in CBCT can be either a magnification, a contraction or a distortion; the last condition is the most prevalent. Furthermore, changes differ considering material, anatomical region and MAR condition.
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Affiliation(s)
- Fernanda Coelho-Silva
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Hugo Gaêta-Araujo
- Oral Radiology Section, School of Dentistry, Federal University of Alfenas, Minas Gerais, Brazil
| | - Lucas P Lopes Rosado
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Deborah Queiroz Freitas
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Francisco Haiter-Neto
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.,Department of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo, Brazil
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Rocha BDC, Rosa BSPA, Cerqueira TS, de-Azevedo-Vaz SL, Barbosa GLDR, Ferreira LM, Verner FS, Visconti MA. Evaluation of different teaching methods in the radiographic diagnosis of proximal carious lesions. Dentomaxillofac Radiol 2020; 50:20200295. [PMID: 33141626 DOI: 10.1259/dmfr.20200295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES To evaluate four different teaching methodologies in the radiographic diagnosis of proximal carious lesions and in the students' perception of these methodologies. METHODS 71 undergraduate dental students were subdivided into 4 groups according to the teaching methodologies used (traditional, hybrid, e-learning and problem-based learning). All methods were applied by two properly trained researchers. Initially, students completed a pre-methodology test (index test). After applying the teaching methodologies, the students were submitted to a post-methodology test containing periapical radiographs for evaluation of proximal carious lesions. Then, the students answered a questionnaire to verify their perception of the different teaching methodologies. Statistical analysis was done. RESULTS There were no relationship between the results of pre- and post-methodologies tests, irrespective of the teaching methodology employed (p > 0.05). No differences between the teaching methodologies studied (p > 0.05) were found regarding the amount of correct answers. However, the students who participated in the active (e-learning and problem-based learning) and hybrid teaching methodology reported a positive impact in relation to their diagnostic skills at the questionnaire. CONCLUSIONS All the tested methodologies had a similar performance; however, the traditional methodology showed less acceptance by the students when analyzed subjectively and comparatively. The results of the present study increase comprehension about teaching methodologies for radiographic diagnosis of proximal carious lesions, and there is a potential to build on the knowledge base and provide practical support for students and educators.
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Affiliation(s)
- Beatriz de Carvalho Rocha
- Department of Pathology and Oral Diagnosis, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | | | - Thaís Santos Cerqueira
- Department of Pathology and Oral Diagnosis, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | | | | | | | | | - Maria Augusta Visconti
- Department of Pathology and Oral Diagnosis, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Coelho-Silva F, Martins LAC, Braga DA, Zandonade E, Haiter-Neto F, de-Azevedo-Vaz SL. Influence of windowing and metal artefact reduction algorithms on the volumetric dimensions of five different high-density materials: a cone-beam CT study. Dentomaxillofac Radiol 2020; 49:20200039. [PMID: 32543940 DOI: 10.1259/dmfr.20200039] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVE To assess the influence of windowing and metal artefact reduction (MAR) algorithms on the volumetric dimensions of high-density materials using two CBCT systems. METHODS Four cylinders of amalgam, cobalt-chromium, gutta-percha, titanium and zirconium, were manufactured and their physical volumes (PV) were measured. A polymethyl methacrylate phantom containing the cylinders was submitted to CBCT acquisitions with Picasso Trio and OP300 units with their MAR enabled and disabled. The tomographic volume (TV) of all the cylinders was obtained by semi-automatic segmentation using two windowing adjustments: W1-large window width and upper window level; W2-narrow window width and low window level. Volumetric distortion was expressed as the difference between TV and PV. Statistics comprised intraclass correlation coefficient (ICC) and analysis of variance (ANOVA) for repeated measures with Tukey post hoc test (α = 5%). RESULTS The ICC values indicated excellent reproducibility of TV. Gutta-percha and titanium resulted in the smallest volumetric distortion. Using W1 provided less volumetric distortion for almost all experimental conditions (p < 0.05). Activating MAR algorithm of Picasso Trio underestimated gutta-percha and titanium TV (p < 0.05) and was inefficient in significantly reducing the volumetric distortion of the other materials (p > 0.05). Disabling MAR algorithm of OP300 resulted in smaller volumetric distortion for almost all experimental conditions (p < 0.05). CONCLUSIONS The TV of gutta-percha and titanium were closer to the PV. In general, the MAR algorithms of both systems were inefficient in significantly reducing the volumetric distortion of high-density materials. We encourage the use of large window width and upper window level to evaluate high-density materials.
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Affiliation(s)
- Fernanda Coelho-Silva
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Luciano Augusto Cano Martins
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Daniela Azeredo Braga
- Bachelor of Statistics in progress, Federal University of Espírito Santo, Espírito Santo, Brazil
| | - Eliana Zandonade
- Department of Statistics, Federal University of Espírito Santo, Espírito Santo, Brazil
| | - Francisco Haiter-Neto
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.,Department of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo, Brazil
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Coelho-Silva F, Fontenele RC, de-Azevedo-Vaz SL, Freitas DQ. A comparative study on image quality of two digital intraoral sensors-methodological, ethical and statistical issues. Dentomaxillofac Radiol 2020; 49:20200054. [PMID: 32250660 DOI: 10.1259/dmfr.20200054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Fernanda Coelho-Silva
- Department of Oral Diagnosis, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
| | | | - Sergio Lins de-Azevedo-Vaz
- Department of Oral Diagnosis, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.,Department of Clinical Dentistry, Federal University of Espírito Santo, Vitória, ES, Brazil
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de-Azevedo-Vaz SL, Machado JVP, Pereira TCR, Freitas DQ. More frequent detection of calcified carotid atherosclerotic plaques and mineralized laryngeal cartilages on digital than on film-based panoramic radiographs. Imaging Sci Dent 2019; 49:65-70. [PMID: 30941290 PMCID: PMC6444012 DOI: 10.5624/isd.2019.49.1.65] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 11/10/2018] [Accepted: 11/23/2018] [Indexed: 11/30/2022] Open
Abstract
Purpose To determine whether calcified carotid atherosclerotic plaques (CCAPs) and mineralized laryngeal cartilages (MLCs) were more frequently detected on digital or film-based panoramic radiographs. The clinical relevance of this question is that some radiopacities seen on digital radiographs may correspond to medium-density tissues that are not necessarily mineralized. Materials and Methods Data were collected from panoramic radiographs and the respective reports issued by 2 private oral radiology centers. A total of 388 radiographs and reports were divided into film-based (group A) and digital (group D) radiographs. The frequencies of CCAPs and MLCs were analyzed using the Fisher exact test, and odds ratios were also calculated (α=1%). Results The mean age of patients whose reports and radiographs showed CCAPs and/or MLCs ranged from 50.1 to 54.1 years. There was a predominance of females. A higher frequency of CCAPs and MLCs was observed in group D than in group A at both centers (P<0.01). CCAPs and MLCs were detected 4 times more frequently in group D than in group A at one of the centers. Conclusion CCAPs and MLCs were more frequently detected on digital than on film-based panoramic radiographs. Further studies are needed to determine whether such radiopacities do indeed correspond to mineralized, rather than medium-density, tissues.
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Affiliation(s)
- Sergio Lins de-Azevedo-Vaz
- Department of Clinical Dentistry, Federal University of Espirito Santo, Vitoria-ES, Brazil.,Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba-SP, Brazil
| | | | | | - Deborah Queiroz Freitas
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba-SP, Brazil
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Darós P, Carneiro VC, Siqueira AP, de-Azevedo-Vaz SL. Diagnostic accuracy of 4 intraoral radiographic techniques for misfit detection at the implant abutment joint. J Prosthet Dent 2017; 120:57-64. [PMID: 29150129 DOI: 10.1016/j.prosdent.2017.08.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 08/08/2017] [Accepted: 08/08/2017] [Indexed: 11/26/2022]
Abstract
STATEMENT OF PROBLEM A misfit or gap at the implant-abutment joint (IAJ) requires detection as it may compromise the health of the peri-implant tissue. However, which radiographic technique provides the most orthogonal relationship between the central beam and the implant/image receptor is unclear. PURPOSE The purpose of this in vitro study was to evaluate the diagnostic accuracy of 4 intraoral radiographic techniques on misfit detection at the IAJ. MATERIAL AND METHODS Twenty implants were placed in polyamide jaws, and customized dental implant abutments with a metal collar were installed. Different gaps were simulated by placing one or three 50-μm-thick polyester strips at the IAJ; the absence of the strip represented the control group (no gap). The 4 radiographic techniques were evaluated by using different film holders: a periapical with bisecting angle (PBA), a bitewing interproximal (BI), a periapical with standard paralleling (PSP), and a periapical with modified paralleling (PMP) holder (with a custom-made paralleling index). A total of 240 digital radiographs were evaluated by 4 clinicians experienced with dental implants. Differences were evaluated by using receiver operating characteristic (ROC) curves (Az) and Fisher tests (α=.05). Diagnostic values (sensitivity, specificity, accuracy, and positive and negative predictive values) were also obtained. The Kappa test was used to assess intra- and interevaluator reproducibility, which ranged from moderate to almost perfect. RESULTS All diagnostic values, except specificity, were lower for the PBA technique for both the 50- and 150-μm gaps. Az values for the PBA technique were significantly lower than those obtained for the other 3 techniques (P<.05), which did not differ from each other. The 150-μm gaps were more easily detected than the 50-μm gaps only for PBA (P<.05). CONCLUSIONS The BI, PSP, and PMP techniques detected misfits at the IAJ most accurately. The PBA technique is not recommended for this purpose.
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Affiliation(s)
- Pollyana Darós
- Postgraduate student, Department of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo, Brazil
| | - Vinícius Cavalcanti Carneiro
- Postgraduate student, Department of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo, Brazil
| | - Amanda Pasolini Siqueira
- Predoctoral student, Department of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo, Brazil
| | - Sergio Lins de-Azevedo-Vaz
- Professor, Departament of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo, Brazil.
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Vasconcelos KDF, de-Azevedo-Vaz SL, Freitas DQ, Haiter-Neto F. CBCT Post-Processing Tools to Manage the Progression of Invasive Cervical Resorption: A Case Report. Braz Dent J 2016; 27:476-80. [DOI: 10.1590/0103-6440201600740] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 04/29/2016] [Indexed: 11/22/2022] Open
Abstract
Abstract This case report aimed to highlight the usefulness of cone beam computed tomography (CBCT) and its post-processing tools for the diagnosis, follow-up and treatment planning of invasive cervical resorption (ICR). A 16-year-old female patient was referred for periapical radiographic examination, which revealed an irregular but well demarcated radiolucency in the mandibular right central incisor. In addition, CBCT scanning was performed to distinguish between ICR and internal root resorption. After the diagnosis of ICR, the patient was advised to return shortly but did so only six years later. At that time, another CBCT scan was performed and CBCT registration and subtraction were done to document lesion progress. These imaging tools were able to show lesion progress and extent clearly and were fundamental for differential diagnosis and treatment decision.
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de-Azevedo-Vaz SL, Peyneau PD, Ramirez-Sotelo LR, Vasconcelos KDF, Campos PSF, Haiter-Neto F. Efficacy of a cone beam computed tomography metal artifact reduction algorithm for the detection of peri-implant fenestrations and dehiscences. Oral Surg Oral Med Oral Pathol Oral Radiol 2016; 121:550-6. [PMID: 27068312 DOI: 10.1016/j.oooo.2016.01.013] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 12/06/2015] [Accepted: 01/18/2016] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To determine whether the use of a metal artifact reduction (MAR) algorithm improves the detection of peri-implant fenestrations and dehiscences on cone beam computed tomography scans. STUDY DESIGN One hundred titanium fixtures were implanted into bovine ribs after the creation of defects simulating fenestrations and dehiscences. Images were acquired using four different protocols, namely, A2 (MAR on, voxel 0.2 mm), A3 (MAR on, voxel 0.3 mm), B2 (MAR off, voxel 0.2 mm), and B3 (MAR off, voxel 0.3 mm). For all protocols, receiver operating characteristic (ROC) curves were determined. Values for the areas under the ROC curves (Az) were subjected to analysis of variance. RESULTS Az values were not statistically different among protocols regardless of the defect type (P > .05). CONCLUSIONS The MAR algorithm tested by us did not improve the diagnosis of peri-implant fenestrations and dehiscences with use of either the 0.2 mm or the 0.3 mm voxel sizes.
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Affiliation(s)
- Sergio Lins de-Azevedo-Vaz
- Department of Clinical Dentistry, Faculty of Dentistry, Federal University of Espirito Santo, Vitoria, Espirito Santo, Brazil.
| | - Priscila Dias Peyneau
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, Sao Paulo, Brazil
| | - Laura Ricardina Ramirez-Sotelo
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, Sao Paulo, Brazil
| | - Karla de Faria Vasconcelos
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, Sao Paulo, Brazil
| | - Paulo Sérgio Flores Campos
- Department of Oral Radiology, Division of Oral Radiology, School of Dentistry, Federal University of Bahia, Salvador, Bahia, Brazil
| | - Francisco Haiter-Neto
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, Sao Paulo, Brazil
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Nascimento HAR, Ramos ACA, Neves FS, de-Azevedo-Vaz SL, Freitas DQ. The 'Sharpen' filter improves the radiographic detection of vertical root fractures. Int Endod J 2014; 48:428-34. [PMID: 24893681 DOI: 10.1111/iej.12331] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Accepted: 05/31/2014] [Indexed: 12/01/2022]
Abstract
AIM To compare the diagnostic accuracy of digital enhancement filters in the diagnosis of vertical root fractures. METHODOLOGY The sample consisted of 40 single-rooted teeth randomly divided into two groups: experimental and control. Vertical root fractures were induced in the experimental group using a universal testing machine. All teeth were individually radiographed with three different horizontal angles using the Digora Optime(®) digital system. Three observers separately examined the original and filtered images (3D Emboss, Negative, Sharpen and Shadow). The area under Receiver Operating Characteristic curve values (Az) for each protocol were compared by one-way anova with post hoc Bonferroni test. The significance level was set at 5%. RESULTS The highest Az value was obtained using the Sharpen filter, with significant differences from the original and other filtered images (P < 0.05). The 3D Emboss filter had the lowest Az value, which was significantly different from the other filtered images (P < 0.05). CONCLUSION When using the Digora Optime(®) system, the 'Sharpen' filter is recommended to improve the radiographic detection of vertical root fractures.
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Affiliation(s)
- H A R Nascimento
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil
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de-Azevedo-Vaz SL, Oenning ACC, Felizardo MG, Haiter-Neto F, de Freitas DQ. Accuracy of the vertical tube shift method in identifying the relationship between the third molars and the mandibular canal. Clin Oral Investig 2014; 19:583-8. [DOI: 10.1007/s00784-014-1277-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 06/25/2014] [Indexed: 11/28/2022]
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Neves FS, Vasconcelos TV, Oenning ACC, de-Azevedo-Vaz SL, Almeida SMD, Freitas DQ. Oblique or orthoradial CBCT slices for preoperative implant planning: which one is more accurate? Braz J Oral Sci 2014. [DOI: 10.1590/1677-3225v13n2a05] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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de-Azevedo-Vaz SL, Alencar PNB, Rovaris K, Campos PSF, Haiter-Neto F. Enhancement cone beam computed tomography filters improve in vitro periimplant dehiscence detection. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 116:633-9. [PMID: 24018127 DOI: 10.1016/j.oooo.2013.06.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2013] [Revised: 06/14/2013] [Accepted: 06/21/2013] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To investigate whether cone beam computed tomography filters would improve periimplant dehiscence detection. STUDY DESIGN A hundred titanium implants were placed in bovine ribs in which defects simulating periimplant dehiscence had previously been created. After images acquisition, three oral radiologists assessed them with and without the following filters: Angio Sharpen high 5 × 5, Shadow, Sharpen 3 × 3, Sharpen Mild, and Smooth. The McNemar test verified the disagreement between all images versus the reference standard and original images versus images with filters; P < .05 was considered statistically significant. RESULTS Dehiscence detection using the original images and the Shadow filter disagreed from the reference standard (P < .05), as well as when using the filters instead of the original images (P < .05). CONCLUSION All the filters tested, with the exception of the Shadow, improved periimplant dehiscence detection. The Sharpen 3 × 3 filter was considered best for this task.
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Affiliation(s)
- Sergio Lins de-Azevedo-Vaz
- Department of Clinical Dentistry, School of Dentistry, Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil.
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de-Azevedo-Vaz SL, Vasconcelos KDF, Rovaris K, Ferreira NDP, Haiter Neto F. A survey on dental undergraduates' knowledge of oral radiology. Braz J Oral Sci 2013. [DOI: 10.1590/s1677-32252013000200008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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de-Azevedo-Vaz SL, Vasconcelos KDF, Neves FS, Melo SLS, Campos PSF, Haiter-Neto F. Detection of periimplant fenestration and dehiscence with the use of two scan modes and the smallest voxel sizes of a cone-beam computed tomography device. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 115:121-7. [PMID: 23217543 DOI: 10.1016/j.oooo.2012.10.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 10/09/2012] [Accepted: 10/15/2012] [Indexed: 12/18/2022]
Abstract
OBJECTIVE To assess the accuracy of cone-beam computed tomography (CBCT) in periimplant fenestration and dehiscence detection, and to determine the effects of 2 voxel sizes and scan modes. STUDY DESIGN One hundred titanium implants were placed in bovine ribs in which periimplant fenestration and dehiscence were simulated. CBCT images were acquired with the use of 3 protocols of the i-CAT NG unit: A) 0.2 mm voxel size half-scan (180°); B) 0.2 mm voxel size full-scan (360°); and C) 0.12 mm voxel size full scan (360°). Receiver operating characteristic curves and diagnostic values were obtained. The Az values were compared with the use of analysis of variance. RESULTS The Az value for dehiscence in protocol A was significantly lower than those of B or C (P < .01). They did not statistically differ for fenestration (P > .05). CONCLUSIONS Protocol B yielded the highest values. The voxel sizes did not affect fenestration and dehiscence detection, and for dehiscence full-scan performed better than half-scan.
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Affiliation(s)
- Sergio Lins de-Azevedo-Vaz
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil.
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