目的 探讨隐形矫治中附件磨损对牙齿移动的影响,为提高矫治效率提供参考。方法 采用CBCT获取牙齿扫描数据,后用mimics,Geomagic 获得牙齿模型,与磨损附件和未磨损附件组装,最后利用ANSYS分析粘接了磨损附件和未磨损附件的牙齿,矫治器施加力量后牙齿位移、牙周膜应力和牙根等效应力的改变。结果 1.用无托槽隐形矫治器对牙齿施加远中扭转力量和冠向位移的力量时,牙齿最大位移明显减小。2.磨损附件使得牙齿在发生冠向位移时,牙齿发生倾斜移动。3.磨损附件使得牙齿受到远中扭转、远中平移、根向位移和冠向位移力量时,牙周膜最大主应力和牙根等效应力均减小。结论 附件磨损后会影响牙齿移动效率,设计时应考虑到磨损的因素对效率的影响。
Objective: To explore the effect of attachment wear on tooth movement in clear aligner treatment, and to provide reference for improving the efficiency of orthodontic treatment. Methods: The tooth scanning data were obtained by CBCT, and then the tooth model was obtained by mimics,Geomagic and assembled with worn and unworn attachments. finally, ANSYS was used to analyze the changes of tooth displacement, periodontal ligament stress and root equivalent stress after clear aligner applied force. Results: 1. When the clear aligner was used to apply distal torsion force and crown displacement force to the teeth, the maximum tooth displacement decreased significantly. 2. The worn attachment causes the tooth to tilt when the crown displacement occurs. 3. When the tooth is subjected to distal torsion, distal translation, root displacement and crown displacement, the maximum principal stress of periodontal ligament and root equivalent stress are reduced. Conclusion: the wear of attachment will affect the efficiency of tooth movement, and the influence of wear factors on the efficiency should be taken into account in the design.