建立不同临床冠根比和唇侧牙槽嵴顶厚度的上颌中切牙三维有限元模型

摘要

Objective:to construct a three-dimensional finite element model of maxillary central incisor with various crown-root ratio and labial alveolar bone width.Methods:after thoroughly cleaning and polished, an extracted maxillary central incisor with normal anatomic structure was scanned with micro-CT technique, and its two dimensional images were transferred into a 3-D model by using the software Mimic, reverse engineering software Geomagic, computer aid design program UG6. The 3-D parametric model of a maxillary central incisor with various crown-root ratio, periodontal membrane and alveolar bone were established in the UG software through its automated modeling.Results:The 3D parametric model with precise anatomical features were successfully established. In the Design Exploration, the clinical crown-root ratio and width of labial alveolar bone were defined as input parameters with the former ranging from 1.1 to 2.5 and the later from 0.1mm to 0.5mm. Conclusion:the 3D parametric model of model of maxillary central incisor with various crown-root ratio and labial alveolar bone width was successfully established by reverse engineering software which had precise anatomical features.%目的：建立不同临床冠根比例和唇侧牙槽嵴顶厚度的上颌中切牙三维有限元模型。方法：选择一颗解剖形态标准的离体上颌中切牙清理抛光后，在显微CT扫描下获得断层二维图像，结合有限元软件Mimics、Geomagic及UG实现三维模型的实体化。利用UG软件构建出牙周膜、松质骨及皮质骨模块，建立上颌中切牙不同临床冠根比例及唇侧牙槽嵴顶厚度的自适应模型。结果：构建了不同临床冠根比例和唇侧牙槽嵴顶厚度的三维有限元模型。将变量冠根比例的变化范围设置为1.1-2.5，变量唇侧牙槽嵴顶厚度的变化范围设置为0.1mm-0.5mm。结论：采用有限元软件建立的不同临床冠根比例和牙槽嵴顶厚度的三维有限元模型，具有良好的力学相似性，能较准确真实地模拟口腔临床实际情况。