牵张力作用下颞下颌关节受力的三维有限元研究

Three-dimensional finite element analysis of stress distribution in temporomandibular joint under distraction forces

目的研究不同方向牵张力作用下颞下颌关节的受力状况,探讨下颌骨牵张成骨过程中牵张力合理的方向。方法通过建立颞下颌关节及下颌骨的三维有限元模型,在模型上模拟牵张力的作用,得到下颌骨牵张成骨过程中,颞下颌关节的受力状况。牵张力的方向为平行于下颌骨下缘或平行于正中矢状面。分别观察牵张延长1mm、3mm、5mm的应力分布状况。结果不同方向牵张力作用下颞下颌关节的受力情况是不同的。当牵张力平行正中矢状面时,颞下颌关节的受力较大。结论在下颌骨牵张成骨过程中,牵张力的方向具有重要的生物力学效果。

Objective To study the stress distribution of TMJ under distraction forces of varying directions and determine the rational direction of the distraction force. Methods The three-dimensional finite element model of the temporomandibular joint and the mandible was established , and the distraction forces were simulated on the model. Stress distribution of TMJ was then observed at 1,3 and 5 mm of distraction length. The distraction force was first parallel to the mandibular body, and then parallel to the mediansagittal plane. Results Stress distribution of TMJ was different when distraction forces were in different directions. Significantly greater stress was seen when distraction force was parallel to the mediansagittal plane. Conclusion The results suggest that the direction of distraction force has biomechanical effects on stress distribution of TMJ during mandibular distraction osteogenesis.