种植体深度和加载方向对下颌骨应力分布影响的三维有限元分析

目的分析下颌骨种植体种植深度和加载方向对周围骨组织的应力分布影响，为临床种植应用提供参考。方法CT扫描一位第一磨牙缺失的健康女性下颌骨，运用MIMICS图像重建其几何结构，ADINA建立下颌骨及种植体平齐0mm、高于1mm、低于-1mm骨界面三种有限元模型，分析比较该模型在垂直和颊舌向两种加载方式下周围骨组织内的应力分布。结果两种加载方式下三种模型相比，最大应力出现的部位没有明显变化，但数值发生了很大变化，以低于骨界面-1mm模型数值最大，高于骨界面1mm模型最小。颊舌向与垂直向加载相比，三种模型均呈现颊舌向数值明显高的态势。结论CT扫描最大限度地忠实于个性化的解剖结构，种植体种植深度和加载方向对骨组织内的应力分布有重要影响，本文结果将为临床种植技术提供一定的理论参考。

Three Dimensional Finite Element Analysis of the Stress Distribution of Mandible with the Effects of Implant Depths and Force Directions

Object To analyze the stress distribution on the surrounding bones impacted by plant depths and force directions, which will provide references for the clinical plant applications. Methods After CT scaning the mandible of a healthy woman without the first molar, We used mimics software to reconstruct the mandible geometry model and used ADINA software to establish three three-dimensional finite element modelings, including 0 mm, more 1 mm（ ＋ 1 mm） and less 1 mm（ - 1 mm） modelings than mandible in order to understand the stress distributions on surrounding bone-implant interface in the vertical loading and buccolingua loading. Results By comparing two loading styles the position of maximum stress is similar for three modelings but the values are very different among them. The maximum value was in the - 1 mm modeling and the minimum value oeeured in the 1 mm modeling. The stress values in three modelings were distinctly more greater along the buccolingua direction than those in the vertical direction. Conclusion Implant depth and loading direction significantly affect the stress distribution around the bone interface, which is bound to provide a theory reference for clinical applications.