分割式及普通可摘局部义齿缺牙区黏膜的三维有限元分析

Three-dimensional finite element analysis of stress distribution on the edentulous mucosa of separate removable partial denture and traditional removable partial denture

目的:研究并比较戴用分割式可摘局部义齿与普通可摘局部义齿在不同载荷下缺牙区黏膜的应力情况。方法:选择上颌第二双尖牙、第一磨牙缺失伴基牙有I度松动的患者1例,通过螺旋CT扫描获得上颌二维断层图像。在Pro/Engineer中进行模型的建立,然后导入ANSYS Workbench软件中,进行网格化分和三维有限元分析。结果:斜向、垂直载荷下,戴用分割式可摘局部义齿与戴用普通可摘局部义齿的缺牙区黏膜Vonmises力的数值范围有明显差异。水平载荷下,二者有一定差异。3种载荷下均为戴用分割式可摘局部义齿较大。3种载荷下二者的Von mises力分布情况相似。结论:从生物力学的角度证明,对基牙有I-II度松动以及牙周健康状况不佳的患者,行分割式可摘局部义齿修复是可行的。可以认为,分割式可摘局部义齿有效地起到了保护基牙的作用。

Objective： To investigate and compare the stress of edentulous mucosa enduring different loads while wearing Separate Removable Partial Denture or Traditional Removable Partial Denture. Methods： A patient with Io mobile abutments of A5, A6, B5, B6 was chosen and spiral CT scanning was performed.. The 3-D model which was established with the software of Pro/Engineer was able to analyse with the software of ANSYS Workbench. Results： There were significant differences in stress value ranges between Separate Removable Partial Denture and Traditional Removable Partial Denture on the edentulous mucosa area while enduring the oblique or vertical loads. There was difference in stress distribution on the edentulous mucosa areas under horizontal loads. Those of Separate Removable Partial Denture were larger. The Von raises were similar under three kinds of loading with the two different dentures. Conclusions.. From the standpoint of dynamics, it is feasible for the patients who have Ⅰ-Ⅱ° mobile abutments and/or suffer from a bad periodontal condition to apply the restorations of Separate Removable Partial Denture.