三种纤维桩系统修复上颌中切牙的三维有限元研究

摘要

Objective To study the stress concentrations in endodontically treated maxillary central incisor teeth restored with 3 kinds of brand ifber post systems subjected to oblique occlusal loads.Methods The tress distribution of the three different post systems Relyx Fiber Post(3M-ESPE)Luxapost(DMG)PD Fiber Post(PD)was studied and analyzed by ifnite element under the same load.Results The data showed that the Relyx Fiber Post generated the least amount of stress concentration.Conclusion Minimal stress buildups contribute to the longevity of the restorations. Thus Relyx Fiber Post by virtue of judicious stress distribution is the better option for restoration of the decayed teeth.%目的：应用三维有限元的应力分析法研究上颌中切牙采用三种不同系统纤维桩修复后的应力变化情况，来比较三种纤维桩系统修复后中切牙各部分的应力大小和分布，从而对临床纤维桩的应用起到一定的指导作用。方法：选取市场上较为通用的三种纤维桩系统，分别为：Relyx Fiber Post（3M-ESPE美国）、Luxapost（DMG德国）、PD Fiber Post（瑞士），通过离体牙的螺旋CT扫描后，Mimics软件建立三维模型，利用Abaqus6.14软件分别采用三种纤维桩系统修复牙体组织，模拟加载咬合力后记录牙本质的Von Mises应力和最大拉应力。结果：相对其他两种纤维桩系统，Relyx Fiber Post的牙本质应力较小，而Luxapost和PD Fiber Post的牙本质应力差异不大。结论：相对其他两种纤维桩系统，Relyx Fiber Post的牙本质应力较小，而Luxapost和PD Fiber Post的牙本质应力差异不大。