自锁托槽对兔牙移动效果影响的实验研究.docVIP

 自锁托槽对兔牙移动效果影响的实验研究# 田佳灵，葛振林** （兰州大学口腔医学院,兰州市 730000） 5 10 摘要：目的:观察自锁托槽与传统结扎托槽对兔上颌切牙移动效果的影响。方法: 以 32 只新 西兰大白兔为研究对象，分别采用自锁托槽与传统结扎托槽移动上颌切牙，观察加力后第 1 至 14 天两组兔上颌切牙间距及牙根变化情况。结果: 两组兔牙均发生倾斜移动。加力后第 1 至第 3 天自锁托槽组上颌切牙间距离大于传统托槽组，差异有统计学意义（p＜0.05）。加 力后第 4 至第 14 天两组切牙间距离均增加，但两组间无明显差异（p＞0.05）。加力后第 14 天，自锁托槽组上颌切牙间距离为 2.45±0.09 mm，传统托槽组为 2.49±0.07 mm。结论:在 必要的矫治加力周期内，自锁托槽与传统结扎托槽在牙齿移动方面并无明显差异。 关键词：自锁托槽；传统结扎托槽；牙移动；摩擦力 中图分类号：R783.5 15 An experimental study of effectiveness of self-ligating brackets during orthodontic tooth movement in rabbits TIAN Jialing1, GE zhenlin2 (1. School of Stomatology,Lanzhou University,Lanzhou Ctiy 730000; 20 25 30 2. School of Stomatology,Lanzhou University,Lanzhou City 730000) Abstract: Objective: To investigate the effects of self-ligating brackets and conventional brackets on the efficiency of maxillary incisors movement in rabbits. Methods: 32 New Zealand rabbits were chosen. The maxillary incisors were treated with self-ligating brackets or conventional brackets respectively. The distance between the incisors was measured from the day 1 to 14 after 60g force was applied. Radiographs were taken to observe the root changes. Results: A tipping movement was observed in both groups. The distance between the teeth in the group of self-ligating brackets was significantly greater than that in the group of conventional brackets during the first 3 days（p＜0.05）. Between days 4 to 14, the distance between the teeth was increased in both group. However, no significant difference was observed（p＞0.05）. The mean distance between the incisors was 2.45±0.09 mm in the group of self-ligating brackets and 2.49± 0.07 mm in the group of conventional brackets at the days 14. Conclusion: In the necessary treatment period, self-ligating brackets are no more efficient than conventional brackets during orthodontic tooth movement. Key words: self-ligating brackets; conventional brackets; orthodontic tooth movement; frictional 35 40 resistance 0 引言 自锁托槽早在 1935 年由美国正畸医师