摘要
目的研究不同厚度上颌中切牙全瓷冠受载时的应力分布特点。方法利用上颌中切牙全瓷冠的三维有限元模型,对3种不同厚度的全瓷冠分别进行100、150、200 N载荷模拟加载,并进行力学分析。结果不同厚度全瓷冠不同载荷下的应力分布趋势相似,应力集中于冠的颈缘及加载点。随着厚度增加,应力集中趋势明显减弱。随着载荷增加,各部位的等效应力相应增加,加载点及颈缘尤为明显。结论全瓷冠厚度的增加可降低应力集中。颈缘和加载点为应力集中区,全冠制作时应注意加强该区域。
Objective To investigate the stress distributions under load in an all-ceramic crown of the upper cen-tral incisor in differential thickness.Methods The 3-dimensional finite element model of all-ceramic crown of the upper central incisor in differential thickness was applied with differential loads（100,150,200 N）.The stress values and distributions of all-ceramic crown were calculated and expressed.Results The tendency of stress distributions in all-ceramic crown of differential thickness and loads was similar.The maximal stress intensity value was located in the loading site and the cervical region.As the thickness of all-ceramic crown increased,the stress concentration re-duced.When the load increased,the stress values increased,especially in the loading site and the cervical region.Conclusion The increasing of the thickness of all-ceramic crown will decrease stress concentration.Because stress concentration is mainly in cervical region and loading site,these regions should be cared in fabrication of all-ceramic crown.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2012年第4期356-359,共4页
West China Journal of Stomatology
基金
江苏省高校高新技术产业化推广基金资助项目(JH10-27)
南京医科大学科学发展基金资助项目(NY04028)
江苏高校优势学科建设工程基金资助项目(2011年)
关键词
全瓷冠
三维有限元模型
应力分布
上颌中切牙
all-ceramic crown
3-dimensional finite element model
stress distribution
upper central incisor
