腭弓-Nance弓联合支抗预防摆式矫治术后复发的临床研究

目的探讨摆式矫治器治疗后腭弓联合Nance弓预防牙及骨骼复发的效果。方法选取10.1～13.6岁的牙性安氏Ⅱ类错患者20例,摆式矫治术推磨牙到远中位,观察3个月后拆除摆式矫治器,两治疗组均行MBT直丝弓托槽固定矫治术,对牙列作进一步矫治,对照组不作支抗保护,试验组采用Nance弓联合腭弓加强磨牙支抗,直至固定正畸治疗结束前,以X线片头影测量分析为测定手段。结果两治疗组的磨牙和下颌骨位置都有复发,但对照组的复发更明显,其差异有统计学意义。结论运用摆式矫治器远中移动上颌磨牙后,腭弓联合Nance弓联合支抗可有效预防术后复发。

Preventing Relapse with Nance Combined with Transpalatal Arch (TPA) after Pendulum Treatment

Objective Research the dental and bone relapse after pendulum treatment. Methods 20 patients were divided into two groups randomly. Pendulum was used in two treatment groups to distalize maxillary molar. When class Ⅲ molar relationship appeared, stop pendulum activation and observe for 3 month. Then pendulum was removed, No anchorage protection was used in control group, Nance combined with TPA was used in experiment group. Fix appliance and straight wire tech were used in two groups. Every patient taken X-ray before treatment （T1） , after pendttlum removal （T2） and after orthodontic treatment （T3）. Cephalometrie analysis was made in every patient. Results When orthodontic therapy was finished, molar and mandible relapse was taken place in two treatment group, but control group relapses more obvious than experiment group, there was statistical difference between two groups. Conclusion Strong anchorage in molar was necessary when pendulum was used in orthodontic therapy.