不同材料套筒冠基牙长轴位移及应力分析

目的研究使用套筒冠义齿修复游离缺失，套筒冠义齿受载时基牙长轴的位移及应力分布情况。方法采用螺旋CT扫描、自编程序和ANSYS软件建立起精确的下颌骨三维有限元模型，并对内层冠赋予不同材料的性质，在基牙上进行加载，分析基牙长轴的位移及主应力的分布情况。结果不同材料所组成的套筒冠，受载后位移和应力分布差异没有统计学意义。套筒冠义齿受载时基牙总体沿长轴方向移动。主拉应力较均匀地分布于两个基牙，最大主压应力分布在第二磨牙的远中颈部。结论套筒冠义齿受载时，基牙总体沿长轴方向移位，应力分布均匀，较好地保护了基牙。

Analysis of the Movement of Long Axis and the Distribution of Principal Stress in Abutment Tooth Retained by Conical Telescope

Objective To study the movement of long axis and the distribution of principal stress in the abutment teeth in removable partial denture which is retained by use of conical telescope. Methods An ideal three dimensional finite element model was constructed by using SCT image reconstruction technique, self-programming and ANSYS software. The static loads were applied . The displacement of the long axis and the distribution of the principal stress in the abutment teeth was analyzed. Results There is no statistic difference of displacenat and stress distribution among different three-dimensional finite element models. Generally, the abutment teeth move along the long axis itself. Similar stress distribution was observed in each three-dimensional finite element model. The maximal principal compressive stress The abutment teeth can be well protected was observed at the distal cervix of the second premolar. Conclusion by use of conical telescope.