安氏Ⅱ~1类错畸形非拨牙正畸治疗后的稳定性调查研究

The stability study of Angle class Ⅱ~1 Malocclusion after nonextractaon orthodontic treatment

目的本研究旨在探讨安氏Ⅱ1类错畸形患者非拨牙正畸治疗后头影测量指标的变化趋势,并探讨和预测影响这些变化的相关因素,以期为临床实践提供参考。方法选取10～26岁之间的安氏Ⅱ1类错畸形患者100例,按年龄分为A、B两组,分别测量在治疗前、治疗后及摘除保持器后1年三个不同时期的头颅侧位片,分析34个头影测量参数,对所得数据采用单因素方差分析,分析3个时期的指标变化,分析各指标变化量间的相关性。结果 A组SNA角减小,SNB角增大,ANB角减小量均大于B组相应值,下颌矢状生长Ar-B,Co-Po增量A组大于B组,保持期A组复发量明显小于B组。结论早期矫治有助于增加安氏Ⅱ1错疗效的长期稳定性。

Objective To investigate the trend of change in cephalometric in Angle＇s Ⅱ1 malocclusion after nonextractaon orthodontic treatment,and to analyze some possible factors which may predict or affect these changes,providing some reference for the clinical practice.Methods The sample consisted of 100 patients with Angle class Ⅱ1 malocclusion between 10～26 years,They were divided into Group A and Group B according to age.To evaluate the cephalometric records of Pre-treatment,Post-treatment and out of retention after one year.Thirty-four cephalometric were chosen to evalute the change of occlusion analysis of Variance,correlation analysis were applied to the data.Results The Group A SNA decreases,SNB increases,ANB decreases,those are higher than the Group B.The growth of Mandibular Ar-B Co-Po are higher in the Group A than B.The Group A are stabler than the Gorup B.Conclusion The early treatment is stable to Angle classⅡ1 Malocclusion.