权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Stress Analytic Study on Fractural Strength and Abutment Form of All Ceramic Crown

全瓷冠断裂强度与基台形式的应力分析研究

基本信息

批准号：
16591932
负责人：
ISHIBASI Minoru
金额：
$ 2.18万
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：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16591932/
关键词：
All Ceramic Crown fracture strength form of abutment fracture test stress analysis marginal curvature labial-lingual dimension flexibility

项目摘要

In order to reveal the relation between fracture strength and abutment form of all ceramic crown, we performed fracture test and 3D-FEA of all ceramic crown. In fracture test we used extracted human maxillar incisors as abutment teeth because extraordinary strength were observed in fracture test using metal abutment. 3D-FEA was executed as contact analysis which was introduced by us previously. In contact analysis, the boundaries between materials were not fixed, and results of contact analysis showed good agree with actual fracture of all ceramic crown. Correlation analyses between fracture strength and measurements of abutment were performed. Results of correlation analyses were compared with results of 3D-FEA.In the correlation analyses, strong negative correlation was observed between fracture strength and height of marginal curvature, and strong positive correlation was observed between fracture strength and labial-lingual thickness of all ceramic crown. These results fitted in well with that of 3D-FEA.In 3D-FEA, concentration of tensile stress are observed at the margin of all ceramic crown, and the tensile stress became higher when marginal curvature became higher. When labial-lingual thickness of all ceramic crown became thick, the tensile stress at margin lowered.In case of high marginal curvature, stretching force were generated by tilting displacement toward labial direction, and in case of thick crowns, the displacement became smaller. These strongly seemed to be related to flexibility of abutment.

为了揭示全瓷冠的断裂强度与基牙形态的关系，我们对全瓷冠进行了断裂试验和三维有限元分析。在断裂试验中，我们使用离体上颌切牙作为基牙，因为使用金属基牙进行断裂试验时观察到了非凡的强度。3D-FEA作为接触分析执行，这是我们以前介绍的。在接触分析中，材料之间的边界并不固定，接触分析结果与全瓷冠的实际断裂情况吻合较好。对基牙的断裂强度与基牙的测量值进行相关分析。相关性分析结果表明，全瓷冠的抗折强度与边缘曲率高度呈显著负相关，与唇-舌厚度呈显著正相关。3D-FEA结果显示，全瓷冠边缘存在拉应力集中现象，边缘曲率越大，拉应力越大。全瓷冠唇舌厚度越厚，边缘拉应力越小，边缘曲率越大，边缘拉应力越大，边缘向唇侧倾斜位移越大，边缘向唇侧倾斜位移越小。这些似乎与基台的灵活性密切相关。