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目的:建立小型猪下颌骨骨性隧道内植皮的有限元模型,以了解骨性隧道内植皮后挛缩的生物力学基础和形变规律。方法:将小型猪下颌骨钻孔形成骨性隧道并移植全厚皮片,通过CT获取移植即刻及移植后2周、4周、6周、8周的骨性隧道内植皮数据,利用MIMICS 10.1和ANSYS 12.0软件建立猪下颌骨钻孔形成骨性隧道的三维有限元模型,仿真分析骨性隧道内植皮后的挛缩过程,计算节点位移及施加应力,获取骨性隧道内植皮挛缩的生物力学基础和形变规律。结果:通过小型猪下颌骨骨性隧道内植皮的有限元分析模型可以直观有效模拟节点位移及施加应力,其仿真分析结果与动物实验几何外形相似程度高,细节损失小;经静力分析发现0周到4周的挛缩过程所受应力的大小约为4周到8周的挛缩过程所受应力大小的6倍,所受应力的方向都是指向隧道中心。结论:有限元分析可以模拟骨性隧道内植皮的挛缩过程,分析骨性隧道内植皮后挛缩局部区域的应力分布及大小,协助临床设计挛缩对抗方案。
OBJECTIVE: To establish a finite element model of mandibular osseointegration in miniature pigs to understand the biomechanical basis and deformation of the contracture after the skin graft in the bone tunnel. METHODS: Bone tunnels were made in mini-swine mandibles and the full-thickness skin grafts were transplanted. The grafts data of bone tunnel immediately after transplantation and at 2, 4, 6 and 8 weeks after transplantation were obtained by MIMICS 10.1 And ANSYS 12.0 software were used to establish the three-dimensional finite element model of bony tunnel formed by pig mandibular drilling. The contracture process of bony tunnel after skin grafting was simulated and the node displacement and stress were calculated to obtain the biomechanical foundation of bony tunnel contracture And deformation rules. Results: The finite element analysis model of miniature pig mandibular internal osseointegration can simulate the node displacement and applied stress intuitively. The simulation analysis results are similar to the animal experiment geometric shape with small loss of detail. The static analysis shows that 0 Thoughtful 4 weeks contracture process stress is about the size of 4 weeks to 8 weeks contracture process by the size of the stress 6 times the direction of stress are directed to the tunnel center. CONCLUSION: Finite element analysis can simulate the contracture process of the skin graft in the bone tunnel, analyze the stress distribution and size of the local area of the contracture after the skin graft in the bone tunnel, and assist the clinical design of the contracture countermeasure.