摘要目的 建立完整的人颅颌面部三维有限元模型,并进行撞击伤模拟验证,为研究颅颌面伤情模拟提供依据. 方法 CT扫描健康成年男性头颅,将数据导入Mimics 15.0软件中,按照骨组织、皮肤组织、皮下软组织分类并分别进行阈值分割与三维重建.将重建数据导入三维逆向软件Geomagic Studi0 2012中,进行图像优化,生成三维实体模型.通过三维控制软件Solidworks 14.0将三部分模型按照实际比例进行装配,并在各层之间建立接触对,设置边界条件.最后在有限元处理软件Hypermesh 12.0中进行体网格的划分,完成模型建立.对模型各层分别赋予材料参数,设置模拟条件,对本模型进行模拟撞击,检验模型性能. 结果 本模型完全由体单元网格构成,共包括214 250个六面体网格单元,411 920个节点.经模拟检验,本模型可清楚显示软组织与硬组织的应力分布、骨折线走向、骨折块移位情况,且模拟结果与临床表现相吻合.结论 建立了完整性较好的人颅颌面三维有限元模型,仿真性能高,可用于颌面部位或头部整体结构的生物力学模拟分析.

abstractsObjective To develop a 3D finite element model for the human craniomaxillofacial region in an attempt to offer basis to the research of simulation of craniomaxillofacial injury.Methods A healthy adult male was submitted to head CT scan, and the data was imported into the Mimics 15.0 software for threshold segmentation and 3D reconstruction according to the classifications of bone tissue, skin tissue and subcutaneous tissue.The reconstruction data was imported into 3D reverse software Geomagic Studio 2012, and the images were optimized and the 3D model was generated.The three parts of the model were fitted according to the actual proportion using the 3D control software Solidworks 14.0, and then the boundary conditions were derived.Hypermesh 12.0 finite element processing software was used to build the volume mesh, and the model was established.Each layer of the model was given to the material parameters, and the simulation conditions were provided to test the model.Results This model was completely composed of volume meshes, including 214,250 hexahedral meshes and 411,920 nodes.This model can clearly show the stress distribution, the trend of fracture line, the displacement of fracture block of soft and hard tissue during the simulation, and the results are consistent with clinical practice.Conclusion A three-dimentional finite element model with good performance is established, which can be used for biomechamics simulation analysis of multiple sites on the head or the whole structure, and has a certain significance in clinical and scientific research.