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Digital Models: Comparison of Scanning Angulations and Superimposition

Open Journal of Stomatology 2020年第8期10卷 218-229页

作者： Bruno Nehme Barbo fabiane azeredo Luciane Macedo de Menezes School of Health and Life Sciences Pontifical Catholic University of Rio Grande do Sul (PUCRS) Porto Alegre Brazil

Background: The aim of this study was to evaluate linear measurements in digital models, scanned at different angulations, in order to compare four methods of superimposing digital models. Methods: Dental models obtained from the database of the School of Health and Life Sciences of the Pontifical Catholic University of Rio Grande do Sul (PUCRS) were scanned three-dimensionally at different angulations (0°, 5°, 10° and 15° in relation to the occlusal plane) and divided in four groups. The sample size was calculated and 43 dental models were used in this study. Linear measurements were obtained to assess the central and lateral portions of the 3D models, so that any possible distortion would be detected. Additionally, the digital models were superimposed using four approaches based on anatomical references: Methods 1 (three central landmarks), 2 (three lateral landmarks), 3 (surface + single landmark) and 4 (surface + three landmarks). Intraclass correlation coefficient was applied to evaluate the intra-observer reliability. Kruskal-Wallis was calculated to compare the groups according to the angulation during scanning, and Kappa to evaluate the agreement between superimposition methods. Results: No differences were found in models scanned at different angulations. Better superimposition correlation was observed between methods 3 and 4 those used techniques based on palatal surface

关键词： Dental Models Dental Scanner Three-Dimensional Orthodontics Palate

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Assessment of alveolar defect volume in unilateral cleft lip and palate patients using a free software program

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Open Journal of Stomatology 2013年第9期3卷 31-36页

作者： Patricia Picolli Luciane Macedo de Menezes Márcia Brucker fabiane azeredo Susana Maria Deon Rizzatto Department of Orthodontics Pontifical Catholic University of Rio Grande do Sul Porto Alegre Brazil Department of Radiology Pontifical Catholic University of Rio Grande do Sul Porto Alegre Brazil Private Practice Porto Alegre Brazil

The purpose of this study was to assess the alveolar defect volume in unilateral cleft lip and palate (UCLP) subjects using computed tomography (CT) and a free software program to evaluate the intra- and inter-rater measurements, and to compare the cleft volume between age and affected side. The sample of this retrospective study consisted of 20 UCLP individuals, 12 boys and 8 girls, mean age 10.3 ± 2.4 years at the beginning of orthodontic treatment. All subjects required alveolar bone grafting. CT scans of the cleft area were obtained prior to secondary bone grafting, and were analyzed using Image J. software program. The cleft volume was calculated based on axial cross-sectional CT images by two raters (orthodontist and radiologist) and by the same rater (orthodontist) at two different moments. Linear mixed model, Bland-Altman, Pearson’s and intraclass correlation coefficient (ICC) were used. The mean cleft volume was 7.53 ± 1.55 mm3. The intra- and inter-rater measurements were reproducible (ICC = 0.976 and 0.963, respectively) with no significant difference between them. There were no statistically significant differences in the cleft volume related to age or cleft location. The assessment of cleft volume in UCLP using CT images and a free software program was a reproducible method. There was no significant relation between alveolar defect volume and age or cleft location.

关键词： Alveolar Process Cleft Palate Computed Tomography Volumetric Assessment

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