上颌牙列及方丝弓矫治器三维有限元模型的建立及验证

目的快速建立高精度的上颌方丝弓矫治器的三维有限元分析模型并进行验证。方法通过多层螺旋CT扫描,获得上、下颌骨及牙列的数据,采用Mimics、Catia及ABAQUS软件相结合的方法,建立包括上颌牙列、牙周膜、牙槽骨、方丝弓矫治器的三维有限元模型,并观察计算机模拟矫治力作用下上颌中切牙应力分布。采用激光散斑剪切实验力学的方法进行验证。结果建立了包含方丝弓矫治器的上颌牙列的三维有限元模型,计算机模拟作用下的应力分布情况与激光散斑剪切试验结果相近,模型的精确性得到了初步有效的验证。结论所建立的三维有限元模型仿真性好,方法便捷有效,为采用有限元法进行正畸生物力学分析的深入研究打下基础。同时可为临床矫治提供一定的指导意义。

Development of three-dimensional finite element model of maxillary dentition and edgewise appliance based on CT images

Objective To develop an effective and feasible method to construct a three-dimentional finite element model of dentulous maxilla and fixed appliance. Methods Scanning images of maxilla, mandible and dentitions were made through multi-slice CT scanner. Mimics, Carla and ABAQUS software were used to reconstruct a three-dimensional element model of maxilla and dentitions with edgewise appliance. The stress distribution of upper incisors was investigated under load with computer simulated a 0.014NiTi,and ESSPI was used to examine the result. Results A three-dimensional solid and finite element model of the maxillary dentition and edgewise appliance was constructed. It could be used to raseareh the mechanical behavior of edgewise appliance.