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目的分析双期矫治恒牙初期骨性安氏Ⅲ类错的疗效及矫治前后的硬组织变化。方法选择2000年1月～2007年12月恒牙初期由于上颌骨发育不足或后缩的骨性安氏Ⅲ类错患者20例,均采用双期矫治,即先进行前方牵引治疗后再固定直丝弓矫治,并进行矫治前后头影测量分析。结果 SNA角增大了3.1°,ANB角增大了3.2°,SN-MP角增大了3.3°,U1-NA距增加了2.2mm,U1-L1角增大了4°,P<0.05,差异有统计学意义。结论前方牵引与固定双期矫治在恒牙初期能促进上颌骨发育,解除前牙反,改善患者面型。
Objective To analyze the effect of double-stage treatment on the early stage skeletal Class Ⅱ malocclusion of permanent teeth and the changes of hard tissue before and after treatment. Methods From January 2000 to December 2007, 20 patients with skeletal Class Ⅲ malocclusion due to maxillary hypoplasia or retrusion were enrolled in this study. All patients were treated with double-phase correction, that is, the patients were treated with anterior traction Straight wire arch correction, and correction of cephalometric analysis before and after. Results The SNA angle increased by 3.1 °, the ANB angle increased by 3.2 °, the SN-MP angle increased by 3.3 °, the U1-NA distance increased by 2.2 mm, the U1-L1 angle increased by 4 °, P <0.05, The difference was statistically significant. Conclusion Anterior traction and fixed double-phase correction can promote the development of the maxilla in the early stage of permanent teeth, lift the anterior crossbite, and improve the patient’s face shape.