Fakir Yaseen, Keanly Colm, Mulder Riaan
Department of Orthodontics, The University of the Western Cape, Cape Town, South Africa.
X-Sight X-ray Services, Cape Town, South Africa.
MethodsX. 2020 Mar 6;7:100851. doi: 10.1016/j.mex.2020.100851. eCollection 2020.
The determination of the orthodontic brackets' adaptation to the curvatures of teeth is a difficult topic to study. The complexity arise due to the different designs of their fitting surfaces, margins and curvatures of orthodontic brackets. Teeth on the other hand have variation in their curvatures and the question remains how well an orthodontic brackets truly adapt to the teeth. Previous methods from the literature determined the curvature of teeth through the superimposition of circular templates onto dental plaster models as well as the use of acrylic arcs of various diameters. Here the authors describe a method to compare the curvatures obtained from an industrial X-ray micro-computer tomography scanner and processing software of orthodontic brackets and plaster casts of teeth. Three orthodontic brackets could be assessed by establishing co-ordinate points of proposed standardized landmarks on the orthodontic brackets. These standardized landmarks from each orthodontic bracket can be applied onto the various plaster teeth that was scanned. The adaptation of the three brackets to the various teeth can be compared by looking at their radii and angles that were determined in this method.•The analysis of orthodontic brackets and teeth curvatures have been streamlined on a virtual platform.•Analysis of X-ray micro-computer tomography of tooth curvatures provide a guide to the range of curvatures that orthodontic brackets need to fit.•X-ray micro-computer tomography of orthodontic brackets can enhance the design of the brackets to fit a large array of tooth curvatures.
确定正畸托槽与牙齿曲度的适配性是一个难以研究的课题。其复杂性源于正畸托槽的贴合面、边缘和曲度的不同设计。另一方面，牙齿的曲度存在差异，正畸托槽究竟能多好地适配牙齿这一问题仍然存在。文献中先前的方法通过将圆形模板叠加在牙科石膏模型上以及使用各种直径的丙烯酸弧来确定牙齿的曲度。在此，作者描述了一种方法，用于比较从工业X射线微型计算机断层扫描仪以及正畸托槽和牙齿石膏模型的处理软件获得的曲度。通过在正畸托槽上建立拟标准化标志点的坐标，可以评估三个正畸托槽。每个正畸托槽的这些标准化标志点可以应用于扫描的各种石膏牙齿上。通过查看用此方法确定的半径和角度，可以比较这三个托槽与各种牙齿的适配情况。
•正畸托槽和牙齿曲度的分析已在虚拟平台上简化。
•牙齿曲度的X射线微型计算机断层扫描分析为正畸托槽需要适配的曲度范围提供了指导。
•正畸托槽的X射线微型计算机断层扫描可以改进托槽设计，以适配大量牙齿曲度。
