Universidade do Estado do Rio de Janeiro, Faculdade de Odontologia (Rio de Janeiro/RJ, Brazil).
Universidade Federal do Rio de Janeiro, Faculdade de Odontologia (Rio de Janeiro/RJ, Brazil).
Dental Press J Orthod. 2023 Jan 6;27(5):e222199. doi: 10.1590/2177-6709.27.5.e222199.oar. eCollection 2023.
Research in Orthodontics and Oral Surgery has been relying on three-dimensional (3D) models to evaluate treatment results with displacement color map techniques, even though it has important limitations.
This study proposed a method of tracking translational movements of 3D objects to evaluate displacements in surfaces with no shape modification.
Cone Beam Computed Tomography (CBCT) data of ten patients were imported to the Dolphin software. A hypothetical virtual surgical plan (randomly defined) was developed in the software and afterwards verified using the proposed method. All the procedures were carried out by two evaluators, in two different time-points, with a 15-day interval. ITK-Snap software was used to generate high quality STL models. Centroid points were automatically generated and their coordinates were compared to confirm if they represented the known displacements simulated. The paired t-test and the Bland-Altman plots were used, as well as the intraclass correlation coefficient.
Interexaminers and intra-examiner tests showed excellent reliability of the method, with mean displacement measurement error values under 0.1mm. The paired t-test did not show any statistically significant differences.
The method showed excellent reliability to track the simulated translational displacements of bone segments.
正畸和口腔颌面外科学的研究一直依赖于三维（3D）模型，通过位移色图技术来评估治疗效果，尽管它存在重要的局限性。
本研究提出了一种跟踪 3D 物体平移运动的方法，用于评估无形状修改的表面的位移。
将十名患者的锥形束 CT（CBCT）数据导入到 Dolphin 软件中。在软件中制定了一个假设的虚拟手术计划（随机定义），然后使用提出的方法进行验证。所有程序均由两名评估员在 15 天间隔的两个不同时间点进行。使用 ITK-Snap 软件生成高质量的 STL 模型。自动生成质心点，并比较其坐标，以确认它们是否代表模拟的已知位移。使用配对 t 检验和 Bland-Altman 图以及组内相关系数进行分析。
组内和组间测试显示该方法具有出色的可靠性，平均位移测量误差值低于 0.1mm。配对 t 检验未显示出任何统计学上的显著差异。
该方法可精确地跟踪骨段模拟的平移位移，具有出色的可靠性。
