摘要
目的 :探讨直丝弓矫治器治疗安氏Ⅱ类Ⅰ分类错牙合中 ,用一步或两步滑动法关闭间隙对牙齿移动的影响。方法 :采用前瞻性配对设计 ,对 2 0例拔除 4个第一前磨牙的安氏Ⅱ1直丝弓矫治病例关闭间隙时进行上颌牙齿移动的对比研究。结果 :两步滑动法在节省支抗方面并不优于一步滑动法 ,且治疗时间明显比一步法长。两种方法在维持覆牙合及前牙转矩方面无显著差别。结论 :一步滑动法在直丝弓矫治技术关闭间隙时更有优势。
Objective:To compare the difference between one-step and two-step Sliding Technique under treatment of Angle class Ⅱ 1 malocclusion using SWA(straight wire appliance).Method:Twenty first premolar extraction patients with Angle class Ⅱ 1 malocclusion were selected and divided into two groups for prospective paired t-test. they were treated by one author using MBT series preadjusted appliance. Space was closed with one-step sliding technique in one group and with two-step sliding technique in another group. Treatment materials, steps and appliance design in both groups were standardized. Measurement of cephalogram was taken.Result:In one-step group and two-step group, the ratio of anterior teeth movement was 0.68 and 0.67 respectively, the difference was not significant(P> 0.05). Upper first molars were enhanced by 0.65 mm and 1.87 mm respectively during space closure, the difference was significant(P< 0.05). The treatment period of time of space-closure stage was 3.5 months longer in two-step group than in one-step group.Conclusion:Two-step sliding technique was not excellent in anchorage control. One-step sliding technique was more favorable in clinical management.
出处
《临床口腔医学杂志》
2003年第10期603-605,共3页
Journal of Clinical Stomatology
