建立三种桩核系统修复下颌第一磨牙的三维有限元模型

Construction of three-dimensional finite element models of the first mandibular molar restored with three post and core systems

目的:建立3种桩核系统冠修复下颌第一磨牙的三维有限元模型,要求建立的模型能尽可能体现生物体建模的相似性要求。方法:采用CT扫描离体下颌第一磨牙,MIMICS软件处理断层影像数据,GEOMAG-IC软件造型、NURBS曲面拟合,ANSYS软件建立实体模型,然后划分网格,建立了下颌第一磨牙桩核冠修复体3个基础模型。结果:建立的下颌第一磨牙桩核冠修复体的三维有限元模型,与临床实际情况有良好的相似性,具有可修改性,网格划分合理,计算结果可信、可比。结论:CT断层扫描技术结合专业逆向工程软件及ANSYS有限元分析软件建模方法准确、有效、可行。

Objective：To establish three-dimensional（3D） finite element models of the first mandibular molar restored with three post and core systems.Methods：Three 3D finite element models of the restored first mandibular molars were constructed by using CT image reconstruction technique.Then MIMICS software was used to separate the areas and to finish 3D calculation.GEOMAGIC software was applied to modify and generate a NURBS surface in each patch.All components of the models were assembled under the ANSYS preprocessor.Specific materials parameters were selected to simulate the various restoration and dentin status.Results：The 3D finite element models of restored first mandible molars were successfully established,which were consistent to the situation observed in the clinical environment.Conclusion：It is a practical and accurate method to establish three-dimensional finite element models by CT image reconstruction technique and reverse engineering software MIMICS and GEOMAGIC.