X线头颅正位定位片硬组织形态二维有限元分析模型的建立

Establishment of a two dimensional finite element analysis model for hard tissue morphology on frontal cephalometric X ray film

目的：建立Ｘ线头颅正位定位片硬组织形态二维有限元分析模型。方法：基于有限元分析的原理，选择头颅正位定位片硬组织标志点作为节点，按照解剖结构及结构间关系对硬组织进行单元划分。结果：选择头颅正位定位片硬组织标志点７１个作为节点，将冠状面上颅颌面硬组织划分成２５个三角形单元，建立了一个较为全面的头颅正位定位片硬组织形态二维有限元分析模型．结论：该模型可用于颅颌面硬组织在冠状面上的形态特征及因生长、正畸矫治、正颌手术引起的形态变化研究。

Objeclive:To estalish a two dimensional finite element analysis model for hard tissue morphology on frontal cephalometric X ray film.Methods:Based on the principle of finite element method,the landmarks on frontal cephalometric X ray film were selected as nodes,by which the hard tissue was divided into small elements according to anatomic structures and their relationship .Results:A relatively complete two dimensional finite element analysis model for hard tissue morphology of frontal cephalometric X ray film was established,on which 71 landmarks were selected as nodes and the craniofacial hard tissue on coronal plane was divided into 25 triangle elements.Conclusions:This model may be applied for the study of morphologic characteristics and changes induced by growth,orthodontic treatment and orthognathic operation on coronal plane.