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A Basic Study on Dental Prosthetic Field with Noncontact Dynamic Stress Analysis System

非接触式动态应力分析系统对牙科修复体领域的基础研究

基本信息

批准号：
02454451
负责人：
MATSUO Etsurou
金额：
$ 4.1万
依托单位：
Kanagawa Dental College
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02454451/
关键词：
Stress Analysis Lower jaw Major connector 下顎骨応力解析モ-ダル解析応力パ-タン

项目摘要

Stress analysis is one of methods which has been used to analyze denture deformation and to observe denture fracture.Matsuo introduced the modal analysis method to observe a denture sample under dynamic load conditions. Modal analysis has made it possible to locate the points of stress concentraction fairly well. But it was found to be unfit to measure stress concentractoin well.We introduced Ometron's non-contact infrared stress analyzer Spate 9000 to measure stress in metal test peaces, major conectors, and a human dry lower jaw.The introduction of the Ometron's equipment has made it possible to obtain dynamic stress distribution patterns in these materials.The results showed that in all of major connector samples, a semi circular stress pattern expanding from the fixed portion, a pattern commonly observed in one-end fastened samples, was observed.We found the propagation routes of shock waves by giving dynamic impact to the dried skulls of humans and monitoring the attenuation of the propagating impact waves. These experiments has made it possible for us to further understand the mechanisms of these skulls' response. A force applied to the lower jaws in maxilla direction propagates through the skull structure in a way to scater across the skull. On the other hand, stress patterns was observed in the corner or the neck of the lower jaw.

应力分析是分析义齿变形和观察义齿断裂的方法之一。Matsuo介绍了模态分析方法来观察动态负载条件下的义齿样品。模态分析可以很好地定位应力集中点。但发现它不适合很好地测量应力集中。我们引进了Ometron的非接触式红外应力分析仪Spate 9000来测量金属测试件、主要连接器和人体干燥下颌的应力。Ometron设备的引入使得获得这些材料的动态应力分布模式成为可能。结果表明，在所有主要连接器样品中，均出现从固定部分扩展的半圆形应力模式，这是常见的模式我们通过对人类干燥头骨进行动态冲击并监测传播冲击波的衰减来发现冲击波的传播路线。这些实验使我们能够进一步了解这些头骨的反应机制。沿上颌骨方向施加到下颌的力通过颅骨结构传播，并在颅骨上分散。另一方面，在下颌角或颈部观察到应力模式。