下颌骨体部缺损钛板重建的生物力学分析

Biomechanical analysis of the plate in fixation of mandibular body defect

目的:通过有限元模型加载,获得下颌骨体部缺损钛板内固定重建的生物力学分布,指导临床治疗。方法:在已经建立的含完整牙列的下颌骨三维有限元模型中,模拟下颌骨体部缺损行内固定钛板重建,并加载分析其下颌骨应力分布情况。结果:应力集中分布于下颌支的前缘、后缘及缺损边缘处钛板,内固定钛板靠近缺损边缘处有应力集中现象,剩余部位应力较小且分布均匀;内固定钛板最具有位移趋势的位置靠近下颌骨缺损前段处。结论:重建钛板靠近缺损边缘处,应力集中是临床上钛板折断、钛钉松动、脱落的生物力学原因。

PORPUSE： This study outlines the methods used to reconstruct a numerical model of the double cortical screw plate in fixation of mandibular body defect to provide reference for clinical treatment.METHODS： The finite element model of mandibular body defect was simulated and reconstructed with double cortical screw plate FEM,and the biomechanical distribution was obtained.RESULTS： Stress concentrated in the anterior mandibular ramus,posterior mandibular ramus and the plate in the defect position.The stress of the plate in the fixed position was smaller and evenly distributed.The most possible displacement trend of the plate was located in the anterior position closed to the mandible defect.CONCLUSIONS： This study provided biomechanical evidence of plate fracture,screw loosing and falling off.