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STUDY ON STRESS INDUCED CORROSION AND LIFETIME OF DENTAL RESIN

牙科树脂的应力腐蚀和寿命研究

基本信息

批准号：
09672020
负责人：
GOTO Takayasu
金额：
$ 1.86万
依托单位：
ASAHI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09672020/
关键词：
Denture base resin Environmental stress cracking Environmental solution Craze Crack growth Stress intensity factor Fracture toughness Three point bending test

项目摘要

This study has been made to clarify the factors affecting a crack growth of denture base heat cured resin. The crack growth of three point bending specimen introduced the precrack was measured at the constant load to investigate the effects of environmental solutions and its concentrations. Furthermore, the relations between crack and craze promoted the crack growth in the presence of environmental solution have been examined by measuring the relationship between load change and crack growth, by observing the crack appeared on the side surface of specimen during the dynamic three point bending test, and by observing the fracture surface using SEM. As a result, the ethanol and acetic acid promoted the crack growth remarkably, and its effect increased with increasing the concentration. This fact indicated that the denture base resin which received both bite stress and environmental solutions such as alcoholic drink and vinegard dish would initiate the crack growth easily. The experimental results of dynamic test and SEM observation showed that the craze was created before the crack started to grow. These results suggested that the crack growth of denture base was proceeded from the craze creation under the bite stress in the first place, and the environmental solution allowed to grow to crack in the second place.

本研究旨在探讨影响义齿基托热固化树脂裂纹扩展的因素。在恒载条件下，对引入预裂纹的三点弯曲试样进行了裂纹扩展实验，研究了环境溶液及其浓度对裂纹扩展的影响。此外，通过测量载荷变化与裂纹扩展的关系，观察动态三点弯曲试验中试样侧面出现的裂纹，以及用扫描电镜观察断口，研究了环境溶液存在下裂纹与银纹促进裂纹扩展的关系。结果表明，乙醇和乙酸对裂纹扩展有显著的促进作用，且促进作用随浓度的增加而增强。这一事实表明，义齿基托树脂在受到咬合应力和环境溶液（如酒精饮料和醋碟）的共同作用下，更容易引发裂纹扩展。动态测试和扫描电镜观察结果表明，银纹在裂纹开始扩展之前就已经形成。这些结果表明，义齿基托的裂纹扩展首先是由咬合应力下的银纹产生，其次是环境溶液允许裂纹扩展。