口外弓在治疗上牙弓拥挤中的应用

The application of headgear in treatment of the upper crowding

目的:评价口外弓颈牵引推磨牙向远中矫治磨牙前移导致的上牙弓拥挤的．临床疗效。方法:对12例磨牙前移的上牙弓拥挤患者,用口外弓推磨牙向远中,结合固定矫治器进行不拔牙矫治,结合X线头影测量分析及模型分析,评价口外弓的治疗作用。采用SPSS13．0统计学软件进行配对t检验。结果:上牙弓拥挤度减少3．0-6．0mm,平均减少4．52mm(P<0．05)。拥挤度的减轻主要来自于上颌第一磨牙向远中移动,治疗后Ptm-U6较治疗前减少1．2-3．5mm,平均减少2．14mm。结论:口外弓推磨牙向远中是有效解决上颌磨牙前移导致的上牙弓拥挤的方法之一。

PURPOSE： To evaluate the treatment effect of headgear for distal movement of maxillary first molars to correct the crowding caused by molar anterior displacement. METHODS： 12 crowding cases were treated with headgear combining with fixed appliances if necessary. Cephalometric radiographs and casts were taken and analyzed before and after treatment. SPSS13.0 software package was used for paired-samples t test. RESULTS： The crowding of upper arch was significantly decreased （P〈0.05）, the amount of crowding decrease was from 3.0 mm to 6.0 mm, the average crowding decrease of 12 cases was 4.52 mm. The decrease was mainly due to the distal movement of the first upper molar, the amount of decrease of Ptm-U6 was from 1.2 mm to 3.5 ram, the average was 2.14 mm. CONCLUSION： Distal movement of the first upper molar by headgear is one of the effective way to solve the upper crowding.