目的：用三维有限元法分析不同大小颏兜后上牵引力作用下髁突软骨和下颌骨的应力分布和位移，探讨颏兜的作用机制。
Objective:To analyze the mechanism of the different chincup forces through the stress distribution of the mandible and the mandibular condylar cartilage.
目的：分析山羊下颌骨牵张成骨中下颌骨牵张延长后髁突软骨表面的应力分布规律。
AIM: To analyze the stress distribution of the condylar cartilage during mandibular distraction osteogenesis in goats.
结论后退大鼠下颌后，髁突软骨后份新骨形成量减少。
Conclusion Posterior movement of the mandible leads to decreased bone formation in the condyle.
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