铸造桩冠修复上前牙桩的力学分析  

An analysis of the stress distribution on the post for a cast post-core system

作　　者：牟永斌[1] 张洁[2] 张栋华[3] 李斌[1] 张红[2] 

机构地区：[1]东南大学附属中大医院口腔科,江苏南京210009 [2]南京大学医学院附属口腔医院修复科,江苏南京210008 [3]南京医科大学附属口腔医院颌面外科,江苏南京210029

出　　处：《南京医科大学学报（自然科学版）》2009年第10期1440-1443,共4页Journal of Nanjing Medical University(Natural Sciences)

基　　金：南京市医学科技发展专项资金资助(YKK07076)

摘　　要：目的:采用三维有限元方法研究铸造镍铬合金核桩冠在修复上颌中切牙时桩的受力情况。方法:螺旋CT机扫描正常人上颌中切牙,处理数据确定牙外周轮廓,获得边界坐标数据。将数据导入ANSYS中得到牙体的三维有限元模型。进行模型整体网格划分,在加载区域施加100 MPa外部静荷载,固定桩长,设定桩顶端直径为3.0、2.0、1.5和1.2 mm,分别计算桩近、远中方向Von Mise应力并分析其变化趋势。结果:桩尖端、距离桩尖2.0 mm、4.0 mm截面处,其所受Von Mise应力均较小,距离桩尖6.0 mm截面处,桩受力值明显增加,顶部唇、腭侧受力随直径增加,增大变化趋势更加明显,顶部近、远中受力变化虽然具有相似趋势,但其绝对值明显小于唇、腭。结论:铸造金属桩冠修复中,桩顶端外形设计成柱形,并尽可能减小桩尖端直径。Objective：To investigate the stress distribution on the post of a cast alloy post-core system by three-dimensional finite element analysis. Methods：A three-dimensional finite element analysis was performed. A simulated post/core/crown restoration was constructed on conventional tooth preparations with various diameter of posts and 2.0 mm ferrules. The crown was loaded with a simulated 100 MPa force at 60° angle with tooth longitudinal axis on the palatal surface of the crown. Von Mises stress within the post structure was recorded and analyzed. Results：In the model the Von Mises stress on the top of the post was much larger than that of the tip of the post. Conclusion：The study confirms that the figure of the top of the post should be column, and the diameter of the post in the tip part should be decreased as soon as possible.

关 键 词：有限元 镍铬合金 核桩 Von Mises应力 

分 类 号：R783.2[医药卫生—口腔医学]