不同体积和材料的桩核修复薄弱根管的应力分析  

Stress of Post and Core with Different Sizes and Materials in Restoring Anterior Tooth with Flared Canals

作　　者：王频[1] 范丽苑[1] 谢翠柳[1] 刘敏[1] 

机构地区：[1]泸州医学院附属口腔医院修复科,四川泸州646000

出　　处：《口腔医学研究》2016年第9期953-956,共4页Journal of Oral Science Research

基　　金：四川省卫生厅基金资助项目(编号:【2011】717号)

摘　　要：目的:分析两种体积不同桩核材料修复薄弱根管的应力分析。方法:用三维有限元法将建立的9个实验模型分为两组,A组为预成桩核组,B组为解剖形桩核组,将纤维桩联合一根辅桩修复的模型作为A、B两组的对照。在模型牙冠切1/3与中1/3处链接5个点成线状135度100N的力加载。比较分析各模型牙体组织、树脂粘结剂、桩核3个部位的应力。结果:牙体组织应力值大小与体积成负相关,与弹性模量的变化无关。桩核表面的应力值与弹性模量成负相关。结论:建议使用铸造桩核、编织纤维桩以及纤维桩联合辅桩等体积较大的桩核修复薄弱根管。桩核材料弹性模量的增加可能会增加桩核脱位的风险。Objectives：To assess the stress of post and cores with different sizes and materials in restoring anterior teeth with flared canals.Methods：Nine 3D models of maxillary first incisors with flared canals restored by two post groups were generated.Group A is restored with preformed posts.Group B is restored with anatomic posts.The model of a quartz fiber post combined with just one auxiliary post is the control one for group A and B.Each model was loaded occlusal force of 100 Non the palatal surface of the crowns at 135 degree angles to the long axis of the tooth.The stresses in the dentin,in the cement,in the post and in the core were analyzed.Results：There was an inverse correlation between the stress of dentin and the volume of the posts.It was failed to establish a correlation between the stress of dentin and the modulus of elasticity of the post and core.The stress of the post and core had an inverse correlation with its modulus of elasticity.Conclusion：It is suggested to restore the tooth with flared canals by larger size posts,such as anatomic one.The post and core are more easy to drop off with larger modulus of elasticity.

关 键 词：桩核 薄弱根管 三维有限元 

分 类 号：R783.2[医药卫生—口腔医学]