全下颌牙种植固定义齿及支持骨应力的三维有限元分析──种植体植入不同深度应力的比较

A 3D-FE Stress Analysis of Complete Mandibular Fixed Prosthesis and the Supporting Bone──Comparative Stress Analysis with Different Depth of Implant in the Bone

本研究应用ＣＴ扫描法借助ＡＮＳＹＳ软件建立了全下颌牙种植固定义齿的三维有限元模型，比较了双颏孔间区螺旋柱状种植体植入深至下颌骨下缘皮质骨及未深至下颌下缘两种不同情况下全下颌种植固定义齿受我时应力分布规律。结果表明：种植体底部是否深至下颌下缘皮质骨，对种植体－支架应力的影响不大，而对周围骨的应力影响较大，在双颏孔间区将种植体深至下颌下缘皮质骨，更有利于应力均匀分布。

In this study a three dimensional finite element model of complete implant-supPOrted fixed prosthesis of the mandible was developed aided by CT scan and ANSYS software.Stress analysis was made with different depth of screw-type implants in the front region of the mandible that the implants were deep into the cortex of lower border or not.Results showed depth Of implantation greatly influenced the periimplant bone stress.Making the implants deep into lower bonier cortex could make stress transfer more evenly.