犬下颌不同程度截骨牵张的有限元应力分析

A biomechanics analysis by finite element method: canine mandibular Partial-cortical-cutting distraction osteogenesis

目的对犬下颌不同程度截骨牵张的有限元模型应力分析。方法有限元模型模拟不完全截骨,在加力(12 N)牵张过程中观察犬下颌皮质骨截骨处(连接处骨片)分别剩2.1、2、1.7、1.4、1、0.8、0.6 mm时其VonM ises应力。结果下颌骨舌侧皮质骨剩余越少,进行牵张成骨时这个区域所受的Von M ises应力就越大。皮质骨所受Von M ises应力可以用其所剩宽度的指数函数y=296.42 e-1.8191x(R2=0.9576)的形式表示。结论犬下颌不同程度截骨牵张的有限元模型初步揭示了截骨长度与截骨区Von M ises应力大小的关系。

[ Objective] To observe the stress when changing the degree of corticotomy during distraction osteogenesis by means of the finite element model of canine mandible. [ Methods ] The method of finite element analysis was used to simulate Partial-cortical-cutting the distraction osteogenesis. The Von Mises stress clouds chart was observed in ＂cut＂ situation when 2.1,2,1.7,1.4,1,0.8,0. 6 nun wide of slice was respectively retained during distraction osteogenesis with the force of 12 newton. [ Results I The less the Mandibular remaining lingual cortical bone, the greater the Von Mises stress in the region of distraction osteogenesis. The Von Mises stress could be expressed in the exponential function y = 296.42e^- 1 s191x （ R^2 = 0. 9576）. [ Conclusion ] The finite element method of canine mandibular Partial-cortical-cutting distraction osteogenesis can provide a quantitative reference for the length of osteotomy and the number of Von Mises stress in osteotomy region.