Objective To compare the different treatment durations between self-ligating brackets and conventional brackets in extraction cases. Methods Sixty extraction cases were collected and randomly divided into two groups(n=30), namely, experimental and control. The experimental group was treated with Damon Q self-ligating brackets. The control group was treated with conventional straight brackets. The durations of the treatments were recorded and compared between the two groups. Results The experimental group finished the treatment at an average of 640 d, where as the control group finished at an average of 686 d. However, no significant difference in treatment duration was found between the two groups(P>0.05). Conclusion The self-ligating brackets did not reduce the duration of the treatment compared with the conventional brackets.
