桩核冠修复下颌中切牙不同长度残根的光弹应力分析  

The photoelastic stress analysis of mandibular teeth roots with different length restored with post-and-core crown

作　　者：张博[1] 赵文峰[1] 张少锋 

机构地区：[1]北京军区总医院口腔科,北京100070 [2]第四军医大学口腔医院修复科,陕西西安710032

出　　处：《临床口腔医学杂志》2011年第9期535-537,共3页Journal of Clinical Stomatology

摘　　要：目的:探讨残根长度对桩核冠修复后应力分布的影响。方法:建立不同长度残根的三维光弹模型,对其进行常规桩核冠修复,运用光弹应力分析法分析残根长度对桩核冠修复后应力分布的影响。结果:正常长度残根应力峰值与天然牙无明显区别(P>0.05),根缩短1/6的残根应力峰值略大于天然牙,但小于天然牙的2倍,根缩短2/6的残根应力峰值略大于天然牙的2倍,根缩短3/6的残根应力峰值远大于天然牙的2倍。结论:正常长度残根,根缩短1/6的残根可用桩核冠修复,根缩短2/6的残根应慎用桩核冠修复,根缩短3/6的残根不宜用桩核冠修复。Objective：To investigate the effects of the stress distribution of the roots with different length after the post-and-core crown restoration.Method：To establish the Photoelastic Model of the roots with different length and restore it with post-and-core crown.To analyse the stress distribution of the roots with different length after post-and-core corwn with Photoelastic stress analysis method.Result：There was no significantly difference between the stress crest values of the the root with normal length and the nature tooth.（P 0.05）.The crest value of the root with shorting 1/6length is higher than the crest value of the nature tooth,but below the twice.The crest value of the root with shorting 2/6 length is two times higher than the nature tooth a little.The crest value of the root with shorting 3/6 length is two times higher than the natrue far.Conclusion：The residual roots with normal length and the length of shortening 1/6 should be repaired with post-and-core crown,the residual roots with the length of shortening 2/6 should be repaired with post-and-core crown cautiously,the residual roots with the length of shortening 3/6 should not be repaired with single-core crown.

关 键 词：残根 桩核冠 光弹应力分析 

分 类 号：R783.3[医药卫生—口腔医学]