双重大连接体式及传统设计RPD各基牙牙周膜受力的三维有限元分析

Three-dimensional finite element analysis of stess distribution of abutments' parodontium in removable partial denture with two different designs

目的:基于已建立的上颌单端游离缺失及整铸义齿的三维有限元模型,比较双重大连接体与传统设计的义齿各基牙牙周膜在加载时的受力。方法:在已建立的有限元模型上赋予不同组织及支架相应的力学参数,在约束设计和载荷设定下,通过三维有限元软件获得两种不同设计各基牙的受力分布,并以该数据进行加载,得到各基牙牙周膜的受力分布情况。结果:双重大连接体设计时,受力主要集中在基牙17的根尖1/3处,基牙14、25没有明显的应力集中;传统设计时,受力主要集中在基牙25的牙颈部。结论:双重大连接体设计能够使牙周受力避开敏感部位起到保护基牙的目的。

Objective To compare with the traditional and the Dual Major Connector design of the abutments＇parodontium in the stress of the loads,based on the established maxillary single end free of defects and the whole casting denture of three dimensional finite element model. Methods Give different organization and support the corresponding mechanical parameters in the established finite element model. In the constraint design and load settings,we get the stress distribution of each abutment in the two different design through the three dimensional finite element software.And then under the loading of this data,we obtain each abutments＂ parodontium stress distribution. Results In the Dual Major Connector, stress mainly concentrated in the root tip a third place of the abutment 17, when the abutment 14 and 25 have no obvious stress concentration;while in the traditional design, the stress mainly concentrated in the tooth neck of abutment 25. Conclusion Dual Major Connector can make periodontal stress avoid sensitive parts to protect the abutment.