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Load Transfer of abutment tooth with post and core for Various mandibular distal extension cases with diminished periodontal support

带有桩核的基牙的负载转移，适用于牙周支持减少的各种下颌远端延伸病例

基本信息

批准号：
15592043
负责人：
ITOH Hidemi
金额：
$ 1.28万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

The purpose of this study was to investigate the stress redistribution in the pulp and non-pulp abutments in bilateral and unilateral distal extension cases with reduced periodontal support of three retainers device configurations based on the RPI system, Konus Krone system, and Bracing arm system using Quasi-three-dimensional Photoelastic method, High-speed Photoelastic Experimental Method and Finite Element Method.Three composite photoelastic models were made of a mandible unilaterally and bilateral edentulous distal to the second premolars. Individual simulant materials were used for tooth structure, periodontal ligament, and alveolar bone of periodontally compromised. Three retainers were cast for the teeth. Unilateral and bilateral partial dentures with three retainer designs, RPI system, Konus Krone system and Bracing arm system were made for the three models. Simulated vertical and lateral occlusal loads were applied to the dentures, and the stresses which developed in the suppo … More rting structures were monitored photoelastically.As a results, it's became clear the following. 1)The stress redistribution patterns in the abutments and surrounding tissues differed between the three systems. 2)The RPI system configurations showed the most uniform redistributions across loads directed in all five directions, while Konus Crone systems showed favorable stress redistribution for vertically, posteriorly, and buccally directed loads and Bracing arms configurations showed favorable stress redistribution for anteriorly and lingually directed loads. 3)the highest stress concentrations were seen in the abutment with the least periodontal support : the 35% horizontal defect. Increasing the number of splinted teeth did not provide a proportional decrease in maximum stress levels. 4)higher stress concentrations were seen in the abutment of non-pulp with post metal core. 5)The differents stress developed by lateral condensation root canal filling using various sizes spreddar. 6)it's became same results both Quasi-three-dimensional Photoelastic Method and Finite Element Method. Less

本研究旨在利用准三维光弹性法，研究在牙周支持减少的情况下，三种固位体（RPI系统、Konus Krone系统和支臂系统）在双侧和单侧远中延伸病例中，牙髓和非牙髓基牙的应力重分布。高速光弹性实验方法和有限元方法：制作了三个下颌第二前磨牙远侧单侧和双侧无牙颌的复合光弹性模型。采用个体化模拟材料模拟牙周损伤的牙齿结构、牙周膜和牙槽骨。为牙齿铸造了三个固位器。分别采用RPI系统、Konus Krone系统和支臂系统三种固位体设计，为三个模型制作单侧和双侧局部义齿。模拟垂直和侧向咬合载荷作用于义齿，测量支持体中的应力， ...更多信息光弹性监测的结构。作为结果，它变得清晰如下。1)基牙及周围组织中的应力重分布模式在三种系统之间存在差异。2)RPI系统配置在所有五个方向上的载荷之间显示出最均匀的再分布，而Konus Crone系统在垂直、向后和颊向载荷下显示出有利的应力再分布，支撑臂配置在向前和舌向载荷下显示出有利的应力再分布。3)最高的应力集中出现在牙周支持最少的基牙：35%水平缺损。增加夹板牙齿的数量并没有提供最大应力水平的成比例降低。4)无髓桩核基牙的应力集中程度较高。5)不同大小的螺旋桨侧向加压根管充填后产生的应力不同。6）准三维光弹性法与有限元法所得结果一致。少