Huang Zheng, Chen Zhi
Key Laboratory for Oral Biomedicine of Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China.
J Huazhong Univ Sci Technolog Med Sci. 2013 Oct;33(5):775-779. doi: 10.1007/s11596-013-1196-6. Epub 2013 Oct 20.
This study describes the details of how to construct a three-dimensional (3D) finite element model of a maxillary first premolar tooth based on micro-CT data acquisition technique, MIMICS software and ANSYS software. The tooth was scanned by micro-CT, in which 1295 slices were obtained and then 648 slices were selected for modeling. The 3D surface mesh models of enamel and dentin were created by MIMICS (STL file). The solid mesh model was constructed by ANSYS. After the material properties and boundary conditions were set, a loading analysis was performed to demonstrate the applicableness of the resulting model. The first and third principal stresses were then evaluated. The results showed that the number of nodes and elements of the finite element model were 56 618 and 311801, respectively. The geometric form of the model was highly consistent with that of the true tooth, and the deviation between them was -0.28%. The loading analysis revealed the typical stress patterns in the contour map. The maximum compressive stress existed in the contact points and the maximum tensile stress existed in the deep fissure between the two cusps. It is concluded that by using the micro-CT and highly integrated software, construction of the 3D finite element model with high quality will not be difficult for clinical researchers.
本研究描述了基于微计算机断层扫描（micro-CT）数据采集技术、MIMICS软件和ANSYS软件构建上颌第一前磨牙三维（3D）有限元模型的详细过程。通过微计算机断层扫描对该牙齿进行扫描，共获得1295层切片，然后选取648层进行建模。利用MIMICS软件创建了釉质和牙本质的三维表面网格模型（STL文件）。通过ANSYS软件构建了实体网格模型。设定材料属性和边界条件后，进行了加载分析以验证所得模型的适用性。随后评估了第一和第三主应力。结果表明，有限元模型的节点数和单元数分别为56618和311801。模型的几何形态与真实牙齿高度一致，两者之间的偏差为-0.28%。加载分析揭示了等高线图中的典型应力模式。最大压应力存在于接触点，最大拉应力存在于两个牙尖之间的深裂处。得出的结论是，对于临床研究人员而言，利用微计算机断层扫描和高度集成的软件不难构建高质量的三维有限元模型。
