口外J钩配合矫治安氏Ⅱ类1分类错疗效观察

Observation on Effect of J Hook Towing Equipment on Angle Class Ⅱ Division 1 Malocclusion

目的 探讨采用口外J钩治疗安氏Ⅱ类 1分类错牙合患者的疗效。方法 对 15例安氏Ⅱ类 1分类需拔牙矫治患者 ,用标准方丝弓矫治技术 ,配合J钩口外牵引 ,关闭拔牙间隙 ,调整咬合关系 ,并对患者治疗前后X线头颅侧位片进行头影测量与分析。结果 口外J钩配合方丝弓矫治技术矫治安氏Ⅱ类 1分类错牙合可获得较理想的治疗效果。结论 口外J钩可有效地防止上颌支抗丧失 ;同时可减少因Ⅱ类颌间牵引而致上前牙伸长 ,达到改善外貌的作用。

Objective To investigate the effect of J hook towing on Angle class Ⅱ division 1 malocclusion. Methods 15 subjects with Angle class Ⅱ division 1 malocclusion were treated with J hook towing to close the gap left by extraction and adjust occlusion. X-ray cephalometrics was taken before treatment and after for analysis. Results It's suggested that satisfactory effect can be achieved by using J hook towing equipment on Angle class Ⅱ division 1 malocclusion. Conclusion J hook towing equipment can avoid upper jaw anchorage loss effectively and improve appearance by reducing the chance of upper anterior teeth stretch and mandible clockwise rotation caused by intermaxillary traction.