Schmitz Jana, Keilig Ludger, Daratsianos Nikolaos, Bourauel Christoph
Department of Oral, Maxillofacial and Plastic Surgery, University Hospital Bonn, Bonn, Germany.
Oral Technology, University Hospital Bonn, University of Bonn, Welschnonnenstraße 17, 53123, Bonn, Germany.
J Orofac Orthop. 2024 Feb 12. doi: 10.1007/s00056-024-00513-6.
Using a commercial orthodontic treatment planning system, tooth movements were simulated to analyse how precise predefined movements can be determined by three different superimposition methods. Additionally, a retrospective analysis on clinical patient models before and after orthodontic treatment was performed to analyse possible differences in determination of clinical tooth movements with these methods.
(1) A hexapod system was used to perform the tooth movements in physical maxillary dental models (N = 70). The initial and final situations were scanned, superimpositions executed, movements calculated, and their accuracy compared to the predefined movements was determined. (2) Digital three-dimensional (3D) maxillary dental models representing pre- and postorthodontic treatment situations (N = 100 patients) were superimposed. Selected tooth movements were calculated (N = 3600), and the results of the different superimposition methods were compared pairwise.
(1) The experimental study delivered only small location and scale shifts. Furthermore, concordance correlation coefficients above 0.99 for all three methods. This verified that all methods deliver values corresponding well to the predefined movements. (2) The retrospective analysis of the clinically performed orthodontic tooth movements comparing pairwise the three different methods intraindividually also showed small location and scale shifts. Furthermore, concordance correlation coefficients between 0.68 and 0.98 were observed, with only three of them below 0.8. This verified that the applied superimposition methods delivered values sufficiently close to each other.
As the experimental study showed very good agreement between the predefined and determined movements, and as the retrospective clinical study showed that the methods compared pairwise delivered values close to each other for the performed orthodontic tooth movements, it can be concluded that orthodontic tooth movements can be determined adequately correct by each of the examined methods.
使用商业正畸治疗计划系统，模拟牙齿移动，以分析三种不同的叠加方法能多精确地确定预定义的移动。此外，对正畸治疗前后的临床患者模型进行回顾性分析，以分析使用这些方法确定临床牙齿移动时可能存在的差异。
(1) 使用六足系统在实体上颌牙模型（N = 70）中进行牙齿移动。扫描初始和最终情况，执行叠加，计算移动，并确定其与预定义移动相比的准确性。(2) 对代表正畸治疗前后情况的数字三维（3D）上颌牙模型（N = 100例患者）进行叠加。计算选定的牙齿移动（N = 3600），并对不同叠加方法的结果进行两两比较。
(1) 实验研究仅产生了小的位置和比例偏移。此外，所有三种方法的一致性相关系数均高于0.99。这证实了所有方法得出的值与预定义移动非常吻合。(2) 对临床进行的正畸牙齿移动进行回顾性分析，在个体内对三种不同方法进行两两比较，也显示出小的位置和比例偏移。此外，观察到一致性相关系数在0.68至0.98之间，其中只有三个低于0.8。这证实了所应用的叠加方法得出的值彼此足够接近。
由于实验研究表明预定义移动和确定的移动之间具有很好的一致性，并且回顾性临床研究表明，对于所进行的正畸牙齿移动，两两比较的方法得出的值彼此接近，因此可以得出结论，所研究的每种方法都能充分正确地确定正畸牙齿移动。
