包含颞下颌关节的颅面三维有限元模型建立

Establishment of three dimensional finite element model of facies crania including temporomandibular joint

目的建立包括颞下颌关节在内的颅面三维有限元模型。为日后通过前方牵引矫治力的加载,探讨前牵引矫治力及反作用力在颅上颌复合体、下颌骨、髁状突和关节窝内的应力分布。方法通过螺旋CT扫描正常志愿者颅面部,将所获得的DICOM格式的图像导入Mimics软件,对包含颞下颌关节的颅面部进行网格划分。结果成功建立起包括下颌骨颞下颌关节在内的颅骨三维有限元模型。所建立颅骨三维有限元模型共包含110 770个节点和28 740个单元,其中中上颌骨由76 892个节点和20 387个单元构成,下颌骨由33 878个节点8 353个单元构成。该模型结构相对比较完整,网格质量良好,与生物实体真实结构具有良好的几何相似性。结论成功建立了包括颞下颌关节在内的颅颌面三维有限元模型,所建模型具有很高的精确性,为日后进行模拟加载试验奠定了基础。

Objective To establish a 3D finite element model of the craniomaxilloface including the temporomandibular joint in or- der that we earl study the stress and strain of the active force and reaction force in the craniomaxillareomplex,themandible, the condyle process and articular fossa during the maxillary protraction. Methods The heads of the volunteerswere scanned by the spiral CT,and then the DICOM data were processed by Mimics and then the thecraniomaxilloface including the temporomandibulary joint were mesh- ed. Results A three dimensional（3-D）finite element model（FEM） of the skull was established successfully including temporomandib- ular joint. The final 3-D FEM was meshed with 110770 entity elements and 28740 nodes. The model of the cranial-maxillary was meshed with 76892 entity elements and 20387 nodes, and the model of the mandibular was meshed with 33878 entity elements and 8353 nodes. The FEM established was relatively complete in structure,with good-quality elements and reasonable partitioning meshes and similar to the human anatomical structure, Conclusions An accurate 3-D FEM of the skull including the TMJ has been established successfully. The FEM model can be used to study the stress distribution and the displacement change on the mandible when a force is loaded on the chin. A solid foundation has been laid for further study.