两种不同开髓路径的上颌中切牙三维有限元分析

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1、硕士学位论文两种不同开髓路径的上颌中切牙三维有限元分析院（系）、所口腔医学院研究生姓名胡静学科、专业口腔临床医学导师姓名李明哲副教授二Ο一二年四月目录1两种不同开髓路径的上颌中切牙三维有限元分析„„„„11.1中文摘要„„„„„„„„„„„„„„„„„„„„„11.2英文摘要„„„„„„„„„„„„„„„„„„„„„21.3前言„„„„„„„„„„„„„„„„„„„„„„„41.4第一部分两种不同开髓路径的上颌中切牙三维有限元模型建立„„„„„„„„„„„„„„„„„„„„„„„81.5第二部分两种不同开髓路径的上颌中切牙三维有限元分析„„„„„„„„„„„„„„„„„„„

2、„„„„„201.6全文总结„„„„„„„„„„„„„„„„„„„„„321.7参考文献„„„„„„„„„„„„„„„„„„„„„331.8英汉缩略词对照表„„„„„„„„„„„„„„„„„372致谢„„„„„„„„„„„„„„„„„„„„„„„383不同开髓路径的比较研究进展（综述）„„„„„„„„40两种不同开髓路径的上颌中切牙三维有限元分析摘要目的:利用三维有限元分析(3D-FEA)的方法，比较两种不同开髓路径的情况下上颌中切牙力学性能的差异，研究牙体开髓路径对各层结构应力分布的影响，为设计优化及临床应用提供理论依据。方法:以螺旋CT薄层扫描的人离体上颌中切牙的影像为

3、基础，结合Abaqus和Mimics软件辅助建立两种不同开髓路径上颌中切牙的三维有限元模型。一组采用传统腭侧开髓不损伤切缘；另一组于唇侧开髓不损伤切缘。100N的模拟静态咬合力，与牙长轴呈45°的方向加载于牙冠舌面中1/3与切1/3交界处，分析计算牙体组织的位移值以及牙体组织的应力分布情况。结果:(1)本研究采用CT薄层扫描技术、Mimics及Abaqus软件相结合的方法成功建立了不同开髓路径的上颌中切牙三维有限元模型。(2)在正常咬合力作用下，切牙唇侧开髓方式的最大综合位移、最大唇腭向位移、最大垂直向位移以及最大近远中向位移均略小于腭侧开髓方式。尤其是最大唇舌向位移和最大

4、垂直向位移最为明显，提示唇侧开髓方式对切牙的生物力学稳定性影响更小。(3)腭侧开髓方式下的切牙的最大VonMises应力远大于唇侧开髓方式。唇侧开髓方式下的切牙VonMises应力分布更为均匀。结论:(1)本研究所建立的上颌中切牙不同开髓路径的三维有限元模型具有良好的实体相似性。与以往大多数建模方法相比，模型更为精确，使用更为灵活，建模更为迅速。(2)上颌中切牙两种不同开髓路径的力学性能并不一致。唇侧开髓应力性能更趋于合理。关键词上颌中切牙三维有限元分析唇侧开髓腭侧开髓直线路径Acomparativestudyoftwodifferentendodonticaccesses

5、inmaxillaryincisorsbasedon3D-finiteelementanalysisAbstract:objective:Thepresentstudycomparesthemechanicalpropertiesoftwodifferentendodonticaccessesinmaxillaryincisorsbymeansof3D-finiteelementanalysis,inordertostudytheinfluenceofendodonticaccessesonstressdistributionfordifferentstructures,a

6、ndprovideatheoreticalbasisforfurtherstudiesandclinicalapplications.Methods:Basedonthethin-layercomputedtomographyofahumanmaxillaryincisorandcombinedwithAbaqusandMimicssoftware,two3D-finiteelementmodelsweredeveloped,representingtwodifferentendodonticaccesses,namelylabialendodonticaccessandp

7、alatalendodonticaccessnodamagetotheincisaledge.Anarbitrarychewingstaticforceof100Nwasappliedwithrespectiveangulationsof45°tothetoothlongitudinalaxisatthelevelofthesurfaceofthedentalcrownsinthirdcutwithone-thirdborder.Thedisplacementvalueandmaximumstressvaluesa