骨缝精确标识性颅面骨三维有限元模型的建立

目的建立骨缝精确标识性颅面骨三维有限元模型，为进一步开展各种正畸一矫形力作用下的颅面部生物力学研究提供一处重要的平台。方法选择替牙晚期10岁女孩干燥头颅骨作为材料供给，要求颅面骨完整无缺损，各骨缝结构保存完好。采用丁氧膏精确定位颅面骨各相关骨缝和标志点的具体位置，螺旋CT扫描获得颅面骨各断层的二维影像，并借助ANSYS程序生成实体模型。根据骨缝标志点的三维坐标确定颅面骨各骨缝结构的空间定位，采用光滑平面简化处理骨缝接触面，骨缝宽度设定为0．2mm。网格划分，力学参数设定，最终建立起骨缝标识性颅面骨三维有限元模型。结果所建立的骨缝标识性颅面骨三维有限元模型几何形态逼真，与实体标本以及三维CT影像相比具有较高的相似性，模型共包括21480个节点和83688个单元。结论通过在干燥头颅骨上对相关骨缝结构进行精确标识，并在建模时做适当的简化处理将骨缝结构所特有的生物力学性质融入三维有限元模型中，进一步提高了所建模型的仿真程度。

The construction of suture marked three- dimensional finite element model of human craniofacial complex

Objective The purpose of this study was to constmct a suture marked 3 - D FEM of human craniofacial complex for future biomechanical study. Methods In this study the analytical model was developed from a dry skull of 10 - year- old girl. Before CT scanning, the sutures were firstly marked because they were indistinguishable in CT films. ANSYS software was used to constmct the FEM which included the craniofacial sutures. Results The suture marked 3 - D FEM established in this study was highly coincide with the dry skull and 3 - D CT image, and the total number of elements and nodes created was 83688 and 21480, respectively. Conclusion The fusion of sutures into the 3 - D FEM of human craniofacial can highly increase its reliability.