关键词: 自锁托槽, MBT托槽, 唇肌功能训练, 口外弓

Abstract:

Abstract：Objective To evaluate the clinical treatment efficiency of Bioquick self-ligating appliance for the non-extraction patients with moderate crowding arch. Methods Twenty-eight non-extraction patients with moderate crowding arch were enrolled in this study. All of these patients were randomly divided into two groups. Fourteen patients from the Bioquick group were treated with Bioquick self-ligating brackets and lip muscles training. Fourteen patients from the MBT group were treated with MBT brackets and face-bow respectively. The cephalometric films were taken and measured immediately before and after treatment. The number of visits and the time of ligation and deligation were recorded and compared. Results The U6S-Y distance and the U6-PP angle of each group were decreased．The difference was statistically significant（P < 0.05）. In the same way，the difference of U6S-Y distance and the U6-PP angle between the measured values before and after was remarkably significant between two groups（P < 0.05）. The arch wire replacement time of Bioquick group was（49.72 ± 10.34）s，and the junction ligation time of MBT group was（238.5 ± 25.29）s，the difference being statistically significant（P < 0.05）. Conclusion For the non-extraction patients with moderate crowding arch，the Bioquick self-ligating bracket systems with lip muscles training can not achieve the same effect of extraoral anchorage，but it can control the degree of anterior teeth obliquity and surface better.

Key words: self-ligating bracket, MBT bracket, lip muscles training, face-bow