中文摘要：

目的建立种植体支抗辅助正畸磨牙的三维有限元模型,观察其生物力学特征。方法利用ANSYS、SolidWorks软件建立微小种植体—骨组织三维模型,于微小种植体顶端1.25 mm处,对种植体加载150 g的水平作用力。以种植体长轴夹角为变量,分为0°、30°、45°、60°、90°。从种植体颈部开始,每隔1.4 mm记录不同倾斜角度的Von-Mises综合应力及位移。结果同一种植长轴下,随着倾斜角度的增加,Von-Mises综合应力逐渐升高,载荷种植体骨界面位移逐渐降低。同一倾斜角度下,随着种植长轴的增加,Von-Mises综合应力和载荷种植体骨界面位移均逐渐降低。倾斜角度为0°、30°、45°、60°、90°的载荷种植体Von-Mises综合应力最高值分别为0.715、3.120、4.104、4.812、5.162 MPa,载荷种植体骨界面位移最高值分别为0.701、0.127、0.135、0.141、0.161μm。结论在150g正畸力作用下,不同倾斜角度的Von-Mises综合应力及位移均较小;联合Von-Mises综合应力与位移分析,建议选择60°载荷种植体作为正畸支抗体。

英文摘要：

Objective To analysis the biomechanics of micro-implant assisted intrusion of orthodontic teeth molar by three dimensional finite element. Methods Micro-implant bone tissue three-dimensional model were established by ANSYS,LOLID-WORKS,Von-Mises stress and displacement between diffeent tiled angle were calculated. Results Under the same planting long axis,with the increase of angle,Von Mises-comprehensive stress increased,and load implant bone interface displacement reduced gradually. Under the same angle,with the increase of planting long axis,Von Mises-comprehensive stress and load implant bone interface displacement were gradually reduced. The tilt angle 0°,30°,45°,60°,90°,micro-implant Von Mises stress and displacement distribution in bone implant neck skin area,maximum Von Mises stress peak value were 0. 614,3. 120,4. 104,4. 812,5. 162 MPa,the highest peak displacement were 0. 701,0. 127,0. 135,0. 141,0. 161 microns. Conclusions Under the 150 g orthodontic force,Von Mises stress and displacement between angle are both small. Based on the different angle loading implants analysis of stress value and displacement,we suggest that 60° implants for orthodontic antibodies.