Digital Models: Comparison of Scanning Angulations and Superimposition

• 作者: Luciane Macedo de Menezes
• 来源期刊: 口腔学期刊(英文)
• 学科: 数学
• 关键词: Dental Models Dental Scanner Three-Dimensional ORTHODONTICS PALATE
• 年，卷（期）: 2020,（8）
• 页码范围: 218-229
• 页数: 12页
• 分类号: O17

摘要

<b><span>Background:</span></b><span> 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. </span><b><span>Methods:</span></b><span> 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</span><span> at different angulations (0<span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">&#176;</span>, 5<span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">&#176;</span>, 10<span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">&#176;</span> and 15<span style="color:#4F4F4F;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">&#176;</span> 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 </span><span>coefficient was applied to evaluate the intra-observer reliability. Kruskal-Wallis </span><span>was calculated to compare the groups according to the angulation during scanning, and Kappa to evaluate the agreement between superimposition methods.</span><span> </span><b><span>Results:</span></b><span> 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 associated to anatomical landmarks to superimpos