基于micro-CT扫描数据的上颌第一前磨牙三维有限元模型的建立

发布时间：2018-07-07 18:00

本文选题：三维有限元 + micro-CT　；参考：《武汉大学》2014年博士论文

【摘要】：目的本方法学研究详细描述了利用micro-CT扫描数据、MIMICS钦件和ANSYS软件,快速准确构建上颌第一前磨牙三维有限元模型的过程。构建该模型为“上颌前磨牙邻面龋微创洞型优化设计”的系列研究奠定了基础。方法使用micro-CT (μCT50)扫描牙齿,获得了1295张断层图像,选择其中648张建模。在MIMICS中获得了牙釉质和牙本质的三维表面网格模型(STL文件),导入ANSYS,构建实体网格模型,赋予材料属性,定义边界条件。为验证有限元模型的可用性,对模型进行分布载荷模拟,评价第一主应力和第三主应力。结果牙齿有限元模型的节点数和单元数分别为56618和311801。离体牙和模型之间几何形状的高度一致性显而易见,两者之间的偏差为0.28%。进行应力加载模拟后,等值线图反映了典型的应力分布模式。最大的压缩应力出现在接触点区域,最大的拉伸应力出现在两个牙尖之间深的沟裂处。结论成功利用micro-CT扫描数据,构建了上颌第一前磨牙三维有限元模型。
[Abstract]:Objective to describe in detail the process of constructing the 3D finite element model of maxillary first premolars by using micro-CT scanning data and ANSYS software. The establishment of the model laid a foundation for a series of research on the minimally invasive cavity design of maxillary premolar caries. Methods Micro-CT (渭 CT50) was used to scan the teeth and 1295 CT images were obtained, of which 648 were selected for modeling. The 3D surface mesh model (STL file) of enamel and dentin was obtained in Mimics. The model was imported into ANSYS. the solid mesh model was constructed, the material attributes were assigned and the boundary conditions were defined. In order to verify the availability of the finite element model, the distributed load simulation is carried out to evaluate the first principal stress and the third principal stress. Results the number of nodes and the number of elements in the tooth finite element model were 56618 and 311801, respectively. The geometric consistency between the isolated teeth and the model is obvious, the deviation between the two is 0.28. After the stress loading simulation, the isoline diagram reflects the typical stress distribution mode. The maximum compressive stress occurs at the contact point and the maximum tensile stress occurs at the deep fissure between the two cusps. Conclusion the 3D finite element model of maxillary first premolars was successfully constructed using micro CT scanning data.
【学位授予单位】：武汉大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：R816.98

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