应用直丝弓矫治器对双牙弓前突进行拔牙矫治前后颌面软硬组织的变化

Treatment changes of bimaxillary protrusion with Straight Wire Appliance

目的 观察直丝弓矫治器对双牙弓前突病例的矫治效果。方法 选择 16例双牙弓前突的病例 ,均拔除四个第一双尖牙 ,应用直丝弓矫治器进行矫治 ,矫治前后拍摄头颅侧位片进行头影测量 ,并对软硬组织变化情况进行配对t检验。结果 上前牙至NA的距离平均减小 5 .2 5mm ,角度减小 13.2 5° ,下前牙至NB的距离平均减少 4 .94mm ,角度减少 9.4 1°。上下中切牙角增加 2 0 .6 3°。鼻唇角平均增加 12 .81°。软硬组织侧貌得到明显改善。结论 对双牙弓前突病例的矫治直丝弓矫治器可以达到其他固定矫治器的效能。而且因其托槽已带有一定的转矩、转倾轴和冠凸距 ,可以缩短矫治时间 ,是一种更先进的矫治器。

Objective To observe the results of treatment with Straight Wire Appliance(SWA) in bimavillary alarch protrusion cases. Method Sixteen bimaxillary protrusion cases with removal of four first premolars were chosen. The cases were treated with SWA. Cephalometrics before treatment and after treatment were performed. The changes of soft and hard tissue were compared by paired t test. Results The distance of upper incisor to NA reduced 5.25mm on average. The disance of lower inciser to NB reduced 4.94mm . The angle of upper and low incisor increase 20.63° . The angle of nose and upper lip increased 12.81° . Conclusion The effect of SWA is similar to other orthodontic appliances in treatment of bimaxillary protrusion.