中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2011年
3期
153-156
,共4页
张娜%封纯真%赵守亮%法永红%蔡兴伟
張娜%封純真%趙守亮%法永紅%蔡興偉
장나%봉순진%조수량%법영홍%채흥위
有限元分析%牙应力分析%根管制备%桩核技术
有限元分析%牙應力分析%根管製備%樁覈技術
유한원분석%아응력분석%근관제비%장핵기술
Finite element analysis%Dental stress analysis%Root canal preparation%Post and technique
目的 观察3种锥度根管采用不同根管桩修复对牙体组织应力分布的影响,以期为临床合理选用根管桩提供实验依据.方法 分别建立35号K锉、ProTaper和Profile器械根管预备后的下颌第一磨牙三维有限元模型,并分别模拟纤维树脂桩、不锈钢根管桩和银汞合金桩根管固位修复.运用Marc有限元软件,采用中央垂直加载,分析3种不同根管桩修复时牙颈部和牙根部应力分布的状况.结果 不同根管锥度对3种根管固位方式下的应力分布趋势无明显影响.不锈钢根管桩应力集中部位主要位于远中牙根中上部,远中根管口最高Von-Mises应力约为45 Mpa;银汞桩应力集中部分主要位于远中根管口上端及髓腔内,远中根管口最高Von-Mises应力约为16 Mpa;纤维树脂桩应力分布较均匀,未见明显应力集中.结论 纤维桩是比较理想的根管固位形式,应力分布接近于无根管桩状态;不锈钢根管桩在根中部容易形成高应力集中,增加根折发生率.
目的 觀察3種錐度根管採用不同根管樁脩複對牙體組織應力分佈的影響,以期為臨床閤理選用根管樁提供實驗依據.方法 分彆建立35號K銼、ProTaper和Profile器械根管預備後的下頜第一磨牙三維有限元模型,併分彆模擬纖維樹脂樁、不鏽鋼根管樁和銀汞閤金樁根管固位脩複.運用Marc有限元軟件,採用中央垂直加載,分析3種不同根管樁脩複時牙頸部和牙根部應力分佈的狀況.結果 不同根管錐度對3種根管固位方式下的應力分佈趨勢無明顯影響.不鏽鋼根管樁應力集中部位主要位于遠中牙根中上部,遠中根管口最高Von-Mises應力約為45 Mpa;銀汞樁應力集中部分主要位于遠中根管口上耑及髓腔內,遠中根管口最高Von-Mises應力約為16 Mpa;纖維樹脂樁應力分佈較均勻,未見明顯應力集中.結論 纖維樁是比較理想的根管固位形式,應力分佈接近于無根管樁狀態;不鏽鋼根管樁在根中部容易形成高應力集中,增加根摺髮生率.
목적 관찰3충추도근관채용불동근관장수복대아체조직응력분포적영향,이기위림상합리선용근관장제공실험의거.방법 분별건립35호K촤、ProTaper화Profile기계근관예비후적하합제일마아삼유유한원모형,병분별모의섬유수지장、불수강근관장화은홍합금장근관고위수복.운용Marc유한원연건,채용중앙수직가재,분석3충불동근관장수복시아경부화아근부응력분포적상황.결과 불동근관추도대3충근관고위방식하적응력분포추세무명현영향.불수강근관장응력집중부위주요위우원중아근중상부,원중근관구최고Von-Mises응력약위45 Mpa;은홍장응력집중부분주요위우원중근관구상단급수강내,원중근관구최고Von-Mises응력약위16 Mpa;섬유수지장응력분포교균균,미견명현응력집중.결론 섬유장시비교이상적근관고위형식,응력분포접근우무근관장상태;불수강근관장재근중부용역형성고응력집중,증가근절발생솔.
Objective To evaluate the effect of root canal taper and post on tooth stress distribution. Methods Three-dimensional finite element models of human mandibular first molar with root canals prepared with 35# K file, ProTaper and Profile were established. The tooth were restored with fiberresin, stainless steel and silver amalgam posts respectively. A vertical load on tooth occlusal surface was simulated. Marc software was used to analyze and calculate the stress distributions in the tooth restored with three kinds of different root canal posts, especially the in the cervical part and root. Results Different tapered root canals had no obvious influence on stress distribution in all three different posts. Stress distribution of stainless steel post located at the cervical and middle part of distal root, the highest Von-Mises stress was about 45 MPa. Stress distribution of silver amalgam post located at the orifice of root canal and pulp fundus, the highest Von-Mises stress was about 16 MPa. Stress distribution of fiber-resin post had no obvious stress concentration. Conclusions Fiber-resin post is the most ideal root canal post. Stainless steel post causes remarkable stress concentration in the root, which may raise the possibility of root fracture.
