下颌第一磨牙种植体周围应力三维有限元分析

The Study on Three-dimension Finite Element Analysis of the Stress Distribution in the Mandible Bone around Dental Implants

目的探讨精确的有限元分析(FEA)模型建立的方法,使FEA分析计算结果更加真实有效。方法采用下颌骨计算机断层扫描(CT)数据、通过计算机图像处理及计算机辅助设计(CAD)技术,获取精确的下颌骨第一磨牙几何模型。应用FEA技术对圆柱状种植体周围骨内应力分布情况进行分析。结果种植体周围应力分布具有高度的非对称性,主要集中于下颌骨舌侧颈部,颊侧主要为拉应力作用,舌侧为压应力作用。结论基于CT数据建立的模型能更真实地反映下颌骨的结构特点,使FEA分析结果更趋于真实。

Objective The aim of this study was to investigate how to model an accuracy 3-dimension Finite Element Analysis (3D-FEA) model.Methods Based on computed tomography (CT) scan data of a woman, a 3D finite element model of the first molar on the left was rebuilt by computer imagines process and computer aided design (CAD). Analysis of the stress distribution on a cylinder dental implant and in the bone around it was conducted.Results The stress distribution showed extremely asymmetry in bucco-lingual section: stress concentrated on the lingual side of the mandible; stress mainly was tensile in buccal side, and on the contrary compressive in lingual side.Conclusion The results were more reliable because this model more really displayed the mandible.