超声冲洗对根管壁应力影响的三维有限元分析  

The stress of root canal wall during ultrasonic cleaning:a 3-D finite element analysis

作　　者：冷飞[1] 仪虹[1] 方国东[2] 

机构地区：[1]哈尔滨医科大学口腔医院,黑龙江哈尔滨150001 [2]哈尔滨工业大学,黑龙江哈尔滨150001

出　　处：《牙体牙髓牙周病学杂志》2009年第7期380-382,389,共4页Chinese Journal of Conservative Dentistry

基　　金：黑龙江省卫生厅医学科研课题(2006-081)

摘　　要：目的:分析在超声冲洗过程中,上颌第一前磨牙根管壁应力大小及其分布。方法:建立上颌第一前磨牙(单根Ⅳ型根管)的三维有限元模型,在此基础上建立根管不同锥度的修改模型,并通过特定的有限元分析软件模拟超声冲洗的振动力学过程,计算修改模型的根管壁应力值、分析应力分布情况以及超声冲洗对不同锥度根管壁应力影响的结果。结果:在超声冲洗过程中,根管壁的最大应力值在牙本质的最大承受范围之内,不会引起牙本质不可逆的形变。根管壁应力主要集中在根管的中1/3段,并且根管壁的应力随着锥度的增加而减小。结论:超声冲洗过程中,根管壁应力集中在根管中1/3段,且应力随着根管锥度的增大而减小。AIM： To analysis the stress of the root canal during the ultrasonic cleaning on the maxillary first premolar. METHODS： We established a three dimensional finite element model of maxillary first premolar （ single root and the type Ⅳ root canal）. The effect of ultrasonic cleaning was simulated by using special finite element soft- ware. On the basis of the established model, modified models of different root canal tapers were established. The stress on the root canal wall was calculated. RESULTS： During ultrasonic cleaning, the max stress of root canal wall was present in the middle 1/3 of the root canal and this stress was safe for root canal wall. With the increase of the root canal＇s taper, the stress of the root canal wall was decreased. CONCLUSION： During ultrasonic cleaning, the maxstress of root canal wall always presents in the middle 1/3 of the root canal, and the stress is decreased with the increase of the root canal＇s taper.

关 键 词：超声冲洗 三维有限元 应力 锥度 

分 类 号：R781.05[医药卫生—口腔医学]