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目的明确颌骨形态的改变在安氏Ⅲ类错牙合高角病例发生、发展中所起的作用,为进一步研究安氏Ⅲ类错牙合高角病例的病因和预后判断因子奠定基础。方法分别选取正常牙合和骨性安氏Ⅲ类错牙合高角复发病例,分别对颅面复合体进行三维重建和在不同牙合位模拟咀嚼肌力进行有限元分析。结果无论在正中牙合位、最大张口位还是最大前伸位,颅面上颌复合体的应力和应变主要集中在关节窝和颧弓根部,在下颌骨主要集中在下颌升支前缘与下颌体交界处的唇侧和舌侧骨板。结论骨性安氏Ⅲ类高角病例颅面复合体形态的改变是机体代偿性适应的结果,与该畸形的复发无关。
Objective To clarify the role of the change of jaw morphology in the occurrence and development of Angle ¢ ó malocclusion and to lay the foundation for further study on the etiology and prognostic factors of Angle ¢ ó malocclusion. Methods High-angle recurrences of normal occlusion and malocclusion of Angle Class III malocclusion were selected. The three-dimensional reconstruction of craniofacial complex and the simulation of masticatory muscle force at different occlusal locations were performed respectively. Results No matter in maxillary occlusion, maxillary opening or maximal forward extension, the stress and strain of craniofacial complex mainly concentrated in the joint socket and the zygomatic arch. The mandible was mainly located in the front of the mandibular ascending branch and the mandibular body Junction of the labial and lingual bone. Conclusion The morphological changes of craniofacial complex in patients with skeletal Class Ⅲ high angle Angiogenesis are the result of compensatory adaptation of the body and have nothing to do with the recurrence of this deformity.