转矩作用对微植体矫治力系内收上前牙影响的三维有限元研究

Three dimensional finite element analysis of the maxillary anterior teeth retraction under torque with micro-implant anchorage system

目的研究转矩力的作用对于微植体矫治力系内收上前牙的影响。方法利用MIMICS软件和有限元软件ABAQUS,建立微植体矫治力系的有限元模型,并在该模型上计算分析有无转矩及转矩作用区域对中切牙和侧切牙移动趋势的影响。结果不加转矩时,中切牙和侧切牙都表现出舌向倾斜的趋势。在100g·cm转矩力的作用下,随着转矩作用区域的增大,中切牙的唇向移动趋势逐渐减小,侧切牙由舌向移动逐渐转为唇向移动。结论转矩能够有效改变牙齿的移动方式,如果转矩从中切牙之间开始向两侧远中方向逐渐减少,效果会更好。

Objective To investigate the influences of torque effect for maxillary anterior teeth retraction using microimplant anchorage system. Methods The three-dimensional finite element model was constructed using MIMICS software and ABAQUS finite element software. Under the situation of no or with torque and for different torque regions, the movement trend of the central incisor and lateral incisor was calculated and analyzed. Results The tendency of both the central and lateral incisor appears a lingual incline movement with no torque. Under the 100 g·cm torque force, with the region of load torque increasing, the labial movement of the central incisor reduced, and the lingual movement of the lateral incisor became more labial. Conclusions Torque was able to change the movement of teeth effectively. If the load torque decreased from the middle of the two central incisors to the distal direction, the results would be better.