The effects of lingual buttons, precision cuts, and patient-specific attachments during maxillary molar distalization with clear aligners: Comparison of finite element analysis
The effects of lingual buttons, precision cuts, and patient-specific attachments during maxillary molar distalization with clear aligners: Comparison of finite element analysis
复制标题
DOI：
10.1016/j.ajodo.2022.10.010
复制
发表时间：
2022-12-20
影响因子：
3
通讯作者：
Fan, Yubo
中科院分区：
文献类型：
--
作者：
Jia, Lurong;Wang, Chunjuan;Fan, Yubo
简介：本研究旨在分析上颌磨牙远移过程中联合使用透明矫治器 (CA) 和辅助设备（精密切割、舌扣和患者特定附件）对前磨牙近中倾斜和挤出的生物力学影响。方法：采用三维有限元方法模拟不同磨牙远移辅助工具的CA临床场景。因此，从凹口、舌扣和钩子向微植入物施加 200 g 的远端力。比较正畸牙齿的移动和牙周膜的静水压力。结果：添加辅助体可以提供上颌牙弓支抗，促进前磨牙远倾和上颌切牙后倾。相比之下，这种效果在针对患者的附件应用中比在其他类型的辅助设备中更为明显。单独应用CA导致前磨牙近中倾斜和挤出，也导致切牙前倾。结论：单独使用CA引起的锚固损失可以在辅助设备的辅助下得到缓解。值得注意的是，患者专用附件通过将锚齿合并为 1 个锚固单元，进一步加强了前弓的锚固。 (Am J Orthod Dentofacial Orthop 2023;163:e1-e12)
Introduction: This study aimed to analyze the biomechanical effects of the combined use of clear aligners (CA) and auxiliaries (precision cuts, lingual buttons, and patient-specific attachments) on mesial tipping and extrusion of the premolars during maxillary molars distalization. Methods: Three-dimensional finite element method was employed to simulate clinical scenarios of CA with different auxiliaries for molar distalization. As such, 200 g of distal force was applied to the microimplants from the notches, lingual buttons, and hooks. Orthodontic tooth movement and the hydrostatic pressure in the periodontal ligament were compared. Results: Adding auxiliaries can provide the maxillary arch anchorage and promote the distal tipping of premolars and retroclination of maxil-lary incisors. In contrast, this effect was more pronounced in patient-specific attachment applications than in other types of auxiliaries. The independent application of the CA caused mesial tipping and extrusion of the premolar and also caused the incisor proclination. Conclusions: The anchorage loss caused by the CA alone could be alleviated with the assistance of auxiliaries. Notably, patient-specific attachments further reinforce the anchorage of the anterior arch by incorporating anchor teeth as 1 anchorage unit. (Am J Orthod Dentofacial Orthop 2023;163:e1-e12)