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目的 探讨上颌前方牵引矫治器在骨性Ⅲ类错牙合矫治中的作用机理。方法 应用上颌前方牵引矫治12例安氏Ⅲ类骨性错牙合的患者 ,比较矫治前后的临床表现及X线头影测量的结果。结果 患者矫治前后的侧貌得到改善 ,并建立了正常前牙覆牙合、覆盖关系和后牙中性关系。治疗前后的SNA角、ANB角、1-SN角、MP -SN角有显著性的差异。结论 上颌前方牵引矫治器有促进上颌骨向前发育、抑制下颌骨向前发育的效果 ,从而调整上下颌骨的相对位置关系 ,使骨性Ⅲ类错牙合得到矫治
Objective To investigate the mechanism of maxillary anterior traction appliance in the treatment of skeletal Class Ⅲ malocclusion. Methods The application of maxillary anterior traction in the treatment of 12 patients with Class Ⅲ skeletal malocclusion was performed. The clinical manifestations and the results of X-cephalometry before and after correction were compared. Results Before and after the treatment, the profile of the patient was improved, and the normal anterior crossbite, the coverage and the neutral relationship of the posterior teeth were established. Before and after treatment of SNA angle, ANB angle, 1-SN angle, MP -SN angle significant difference. Conclusion Anterior maxillary distraction appliance can promote the forward development of the maxilla and inhibit the forward development of the mandible, so as to adjust the relative position of the maxilla and mandible and to correct the skeletal Class Ⅲ malocclusion