有限元法分析不同桩核材料对全瓷冠应力分布规律的影响

目的：探讨不同桩核材料对全瓷冠应力分布规律的影响，为临床修复设计提供依据。方法：利用螺旋CT断层图像，构建上颌第一磨牙舌侧1／2缺损桩核及全瓷冠修复的有限元分析模型，设计垂直集中载荷600N的加载方式，利用ANSYS软件分析全瓷冠的最大张应力和vonmises应力值。结果：全瓷冠的VOllraises应力和最大张应力均集中于载荷加载部位，并呈放射状向周围递减，vonnlises应力的集中区域向颊侧方向延伸。结论：桩核材料弹性模量不同对全瓷冠的应力分布影响较大，临床上应根据牙体缺损情况选择桩核材料。

3-D Finite element analysis of All-ceramic crown stress distribution subjected to various Post-and-core appli- cations.

Objective： To investigate the relationship between the different teeth post and core materials and stress distribution of all-ceramic crown and provide the basis for the design of clinical repair. Method： The fault images of spiral CT were used to construct the finite element analysis model of l / 2 defect in lingual side of maxillary first molar and all- ceramic crown, and load way was designed： 600 N load was vertieally concentrated, and ANSYS software was used to analyze the stress values of all-ceramic crown and dentin. Result：The von raises stress of all-ceramic crown and maximum tensile stress loads are concentrated on the loading area and was decreased progressively and radially towards surrounding. Con- clusion： Because different teeth post and core materials can affect the stress distribution of all-ceramic crown significantly. In clinic, the suitable teeth post and nuclear materials were chosen according to dental defect of patients.