口外弓推磨牙向后治疗安氏Ⅱ类1分类错(牙合)的分析研究

目的 :探讨口外弓推磨牙向后治疗安氏 II类 1分类错牙合的机制。方法 :对 12例安氏 II类 I分类错牙合的少年进行口外弓推磨牙向后治疗 ,第二期用方丝弓矫治器治疗 ;对两期相关的软硬组织进行 X线头影测量。结果 :口外弓推磨牙向后的治疗使颌骨、牙齿、软组织有不同程度的改变 ,主要通过抑制上颌骨 ,使下颌正常生长而使 ANB明显减小 ;口外力也使上中切牙倾斜度明显减小。方丝弓矫治器使治疗更完善。结论 :口外弓推磨牙向后配合方丝弓矫治器是不拔牙治疗安氏 II类 1分类错牙合简便有效的方法之一。

An evaluation for treatment of Class II malocclusion by extraoral force

Objective: To analyse the effects of the treatment of Class II malocclusion by extraoral force. Methods: 12 young patients were treated with head gear extraoral force moving upper first molars distally and then with edgewise appliance.Lateral head cephalograms were taken before and after treatment. Results: Hard and soft tissues both changed in vary degrees.The obvious decrease of ANB angle and inclination of upper central incisor resulted from curbing maxillary and having mandibular growth normally by extraoral force.The effects were consolidated by edgewise appliance in the second period. Conclusion: Extraoral force conbining edgewise appliance is one of the most simple and effective nonextraction treatments for Class II division 1 malocclusion.