建立下颌角截骨整形手术三维有限元模型

Establishment of three-dimensional finite element model for mandibular angle osteotomy

目的为研究下颌骨截骨整形手术,建立生物力学相似性较高的无牙下颌骨和颞下颌关节三维有限元模型。方法以颅颌面系统正常的女性青年志愿者为标本,用CT断层扫描,结合Solidworks和Ansys软件建模。采用只承受拉力的Link10单元模拟下颌韧带和咀嚼肌约束,采用接触单元对关节窝约束进行模拟。结果建立了包括颞下颌关节、肌肉和韧带的正常下颌骨三维有限元总体模型。可根据实验设计建立实验分模型。结论提高了模型的相似性,为进一步研究下颌角截骨整形奠定了基础。

Objective To study the mandibular angle osteotomy and to establish a more precise method for establishment of the 3 dimensional（3D） finite element model of edentulous mandible and temporomandibular joint（TMJ）.Methods The CT images of a young female volunteer were analyzed and managed with DICOM standard and Mimics software.Tension-only Link10 element and contact element were both used for boundary condition in ANSYS finite element software.Results A whole 3D finite element model comprising the mandible,TMJ,muscles and ligaments was established.Conclusion A 3D finite element model of mandible and TMJ with highly biomechanical similarity is established for the further study of mandibular angle osteotomy.