中文摘要：

目的在无托槽矫治器作用下，研究分析上颌尖牙的生物力学，了解无托槽矫治器的作用力系以及作用效果。方法建立包括牙槽骨、牙周膜和牙髓在内的上颌尖牙三维有限元模型及其无托槽矫治模型。根据尖牙向外倾斜的畸形情况，设计多个模拟算例。在此基础上分析无托槽矫治器的力、力偶和力矩等，并分析无托槽矫治器作用下的矫治力和应力分布。同时与传统的有托槽固定矫治器的相关结果作对比分析。结果分别在无托槽和传统的有托槽固定矫治器作用下，上颌尖牙的牙周各组织应力最大值相近，并且应力变化趋势相似。结论通过设计合理的无托槽矫治器，可以控制牙齿的移动，从而达到良好的临床治疗效果。

英文摘要：

Objective By biomechanical research on maxillary canine with invisible orthodontic appliances, analyze the features of the orthodontic forces and effect of invisible appliances. Method A three-dimensional FE model of canine with the invisible appliance was set up, which includes alveolar bone, penodontal membrane and pulp. Aiming at one kind of tooth＇s monstrosity, several simulated cases were designed and analyzed numerically. The forces and moments from the invisible appliance were analyzed. The force and stress distributions applied with the invisible appliance were obtained. And the comparative study was made between the invisible appliance and the traditional fixed aligner. Result Applied with both the invisible appliance and the traditional fixed aligner, the maximal stress on tissues around the maxillary canine showed greatly close, and changing tendency of stresses are very similar. Conclusion Good clinical effect can be gained with the properly designed invisible appliance.