中文摘要：

构建全口覆盖义齿三维有限元模型，分析不同颌弓形态对全口义齿应力分布的影响规律。对不同的石膏模型采用层切的方法，获得不同层的二维坐标点数据，导入ANSYS软件，建立典型的尖、圆、方形共9种颌弓形态所对应的全口覆盖义齿三维有限元模型。对全牙列加载，进行生物力学分析。结果显示，应力从高到低的顺序为方形、圆形、尖形；外推形式、基本形式、内推形式。提示三维有限元模型具有很高的仿真精度，分析结果为临床工作提供了实验依据和指导。

英文摘要：

This study aimed to construct three-dimensional finite element model of the mandibular complete overdenture and to analyze the influence rules for stress distribution under different mandibular shapes. The layer cutting method was employed as a basic tool to deal with different plaster models to gain two-dimensional point data. These data were introduced to the commercial software ANSYS to construct three-dimensional finite element model of the mandibular complete overdenture, including nine kinds of typical shapes, such as sharpness, roundness and squareness, and etc. Static loads were imposed on denture so as to accomplish biomechanical analysis and to study the influence rules of stress distribution for mandibular complete overdenture under different mandibular shapes. Results revealed that the sequence of stress from high to low was squareness, roundness, sharpness and the other extrapolated, basic and inside. The three-dimensional finite element model has high simulation accuracy and the results provide an experimental foundation and guidance for clinical work.