Department of Neurosciences, Reproductive Sciences and Oral Sciences, School of Orthodontics, University of Naples Federico II, Via Pansini, 5, 80131, Naples, Italy.
Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, Via Al-Lende, 84081, Baronissi, Italy.
Sci Rep. 2024 May 18;14(1):11348. doi: 10.1038/s41598-024-61594-2.
Clear aligners are employed daily for the treatment of several malocclusions. Previous clinical studies indicated low accuracy for the correction of tooth rotations. The aim of this study was to evaluate the predictability of tooth rotations with clear aligners. The sample comprised 390 teeth (190 mandibular; 200 maxillary), measured from the virtual models of 45 participants (21 men, 24 women; mean age: 29.2 ± 6.6 years old). For each patient, pre-treatment (T0) digital dental models (STL files), virtual plan (T1) and post-treatment digital dental models (T2) of both the mandibular and maxillary arches were imported onto Geomagic Control X, a 3D metrology software which allows angular measurements. Rotations were calculated by defining reproducible vectors for all teeth in each STL file and superimposing both T0 with T1 to determine the prescribed rotation, and T0 with T2 to determine the achieved rotation. Prescribed and achieved rotations were compared to assess movement's accuracy. The Wilcoxon signed-rank test and paired t-test were used to assess differences between the prescribed and achieved movements (P < 0.05). The overall predictability of rotational movement was 78.6% for the mandibular arch and 75.0% for the maxillary arch. Second molar accuracy was the lowest in both arches. Clear aligners were not able to achieve 100% of the planned movements.
透明牙套被广泛应用于多种错颌畸形的治疗。既往的临床研究表明，其在纠正牙齿扭转方面的准确性较低。本研究旨在评估透明牙套矫正牙齿扭转的可预测性。该研究样本包括 390 颗牙齿（190 颗下颌牙，200 颗上颌牙），来源于 45 名参与者的虚拟模型（21 名男性，24 名女性；平均年龄：29.2±6.6 岁）。对于每位患者，均采集治疗前（T0）、治疗中（T1）和治疗后（T2）的数字化牙颌模型（STL 文件）。将所有患者的下颌牙和上颌牙的 T0、T1 和 T2 模型导入Geomagic Control X 软件（一款 3D 计量软件，可进行角度测量）。通过定义每个 STL 文件中所有牙齿的可重复向量，并将 T0 与 T1 进行叠加以确定预定的旋转角度，将 T0 与 T2 进行叠加以确定实际的旋转角度，来计算牙齿的扭转。将预定的旋转角度与实际的旋转角度进行比较，以评估移动的准确性。采用 Wilcoxon 符号秩检验和配对 t 检验来评估预定运动与实际运动之间的差异（P<0.05）。对于下颌牙，旋转运动的总体预测率为 78.6%，对于上颌牙，旋转运动的总体预测率为 75.0%。第二磨牙的准确性在上下颌牙中均较低。透明牙套无法实现 100%的计划移动。
