腭穹隆形态对无牙上颌应力分布的三维有限元分析

目的研究腭穹隆形态对无牙上颌应力分布的影响。方法模拟五种咬合状态,对尖、平、凹三种腭穹隆形态无牙上颌的三维有限元模型进行加载。结果在五种加载条件下,三种腭穹隆形态无牙上颌的唇系带切迹区及牙槽嵴顶区为压应力集中区。在所有加载方式下,凹型腭穹隆形态无牙上颌的唇系带切迹区、上腭区及牙槽嵴顶区压应力峰值均高于平型,尖型最低。结论腭穹隆形态对无牙上颌的压应力分布状况无明显影响,对各压应力区应力值大小有影响;无牙上颌压应力的分布及大小与加载方式有关。

Three-dimensional finite element analysis on the effect of palatal vault shape on the stress distribution of edentulous maxilla surface

Objective To study the effect of different palatal vault shape on the stress distribution of edentulous maxilla surface.Methods Using three-dimensional finite element method(3-D FED),we simulated five bite states,putting five loading conditions on 3-D FED model of maxillary edentulous with three different palatal vault shapes.Results We obtained the stress value and multicolor picture of 3-D FE model.Labial frenal notch zone and alveolar ridge zone were the stress concentration zone of the maxillary edentulous with three different palatal vault shapes under five kinds of loading conditions.The deep palatal vault maxillary edentulous almost had the maximum stress values in labial frenal notch zone,palate zone and alveolar ridge zone,and upper edentulous jaw with palatal torus was the minimum.Conclusion Palatal vault shape can change the stress value of edentulous maxilla surface,but cannot change the stress distribution.Loading condition can change the stress distribution and stress value.