计算机辅助下颌骨个体化功能性修复的三维有限元分析

目的:探讨下颌骨缺损个体化功能性修复三维有限元模型的初步建立和生物力学分析,为下颌骨缺损的个体化功能性修复提供生物力学指导。方法: 在CT扫描获取下颌骨断层解剖信息的基础上进行三维重建,重建模型实体化后模拟颌骨缺损,设计个体化带种植体三维钛网修复体加以修复,然后进行三维有限元建模和应力分析。结果:所建下颌骨缺损个体化功能性修复的三维有限元模型几何相似性好,力学分析证实这种个体化功能性三维网状修复体早期能对骨缺损断端起到良好的固定作用,后期骨应力遮挡影响不大。结论:采用CT扫描获取下颌骨原始解剖信息的基础上,利用计算机可以建立下颌骨个体化功能性修复的三维有限元模型,利用此模型进行生物力学分析可以指导下颌骨缺损的个体化功能性修复。

Biomechanical Analysis of Computer Aided Individualized Functional Reconstruction of Mandible Defect by 3D FEA

Objective: From the study of the establishment of three-dimensional finite element model of the individualized functional reconstruction of mandible defect and relevant biomechanics analysis to provide biomechanics guidance for the individualized functional reconstruction of mandible defect. Methods: At first the layer anatomic information of the mandible was collected, then 3-dimensional mandible model reconstructed. After the model was solidified, mandible defect imitated and three dimensional mesh implant designed and assembled with the model. Then finite element model was established by using finite element software and relevant biomechanics analysis was carried out. Results: The three-dimensional finite element model of individualized functional reconstruction of mandible defect was successfully established. The biomechanics analysis based on this model showed that the individualized functional three-dimensional mesh implant could provide reliable fixation of the end of the defect in early stage and had low stress shielding in later stage. Conclusion: Based on the collection of original layer anatomic information of the mandible, three-dimensional finite element model of individualized functional reconstruction of mandible defect can be successfully established and relevant biomechanics analysis can be carried out. This can guide the reconstruction of mandible defect clinically.