不同载力方式对可摘局部义齿有限元应力分析的影响  

Influence of Different Loading Forms on the Finite Element Stress Analysis

作　　者：韦健[1] 徐镔亭[1] 李清[2] 王贻宁[2] 

机构地区：[1]武汉大学口腔生物医学教育部重点实验室.湖北省口腔基础医学重点实验室-省部共建国家重点实验室培育基地,湖北武汉430079 [2]武汉大学口腔医学院修复科

出　　处：《口腔医学研究》2013年第5期417-420,共4页Journal of Oral Science Research

基　　金：国家自然科学基金(编号:81100784)

摘　　要：目的:分析比较可摘局部义齿有限元分析中不同的力量加载方式对应力分布的影响,并探讨T-Scan数字化咬合分析系统在可摘局部义齿有限元分析中的应用。方法:利用非接触式红外扫描仪和Simpleware软件包对下颌肯式Ⅱ类牙列缺损模型和可摘局部义齿模型进行三维建模,使用T-scan数字化咬合分析系统获得咀嚼力的分布,在Abaqus软件中分析比较不同载力方式对牙槽骨上应力分布的影响。结果:加载合力越大,缺失侧近中基牙牙槽窝和剩余牙槽嵴上的应力也越大;同等大小的加载合力条件下,合力中心靠近缺失侧近中基牙时,基牙牙槽窝上会产生更大的应力集中,剩余牙槽嵴上应力分布则更均匀。结论:不同载力方式会对可摘局部义齿三维有限元分析带来明显影响;T-Scan可获得更可靠的咬合力分布并用于指导可摘局部义齿有限元分析的力量加载。Objective： To evaluate the influence of different loading points and quantities on the stress distribution and the application of T-Scan in the three-dimensional finite element analysis. Methods： FE model was created which included： alveolar bone, mucosa, abutments, periodontal ligaments, framework and artificial teeth. The biting force distribution intra-oral was obtained by using the appliance of T-Scan. Then three kinds of vertical load- ings with different loading points and quantities were applied on the artificial teeth of the RPD and the stress distri- butions on the alveolar bone were evaluated. Results： The stress on the alveolar bone was higher when the quantity of the vertical loading increased. Under the same quantity of loadings, the stress in the alveolus of the distal abutment increased when the loading was closer to the mesial aspect, and stress on the residual alveolar ridge was more well-distributed. Conclusion： Different loading points and quantities can influence the stress distribution of the fi- nite element analysis and T-Scan is an effective method to obtain reliable loading form.

关 键 词：三维有限元 可摘局部义齿 载力方式 

分 类 号：R783.6[医药卫生—口腔医学]