自锁托槽与双翼托槽滑动法关闭间隙的临床比较

目的：比较3M SmartClip自锁托槽与3M Gemini MBT双翼托槽在拔除第一前磨牙患者使用滑动法关闭间隙的速度。方法选择需拔除第一前磨牙矫治的安氏Ⅰ类错患者20例，采用自身牙弓左右对比的方法，即牙弓一侧第二前磨牙和第一磨牙粘接3M自锁托槽，另一侧粘接Gemini MBT双翼托槽。排齐整平后用0.48 mm ×0.64 mm（0.019英寸×0.025英寸）不锈钢丝及镍钛拉簧关闭间隙，计算关闭间隙的平均速度（mm/月）。结果自锁托槽侧的平均移动速度是1.03 mm/月，传统双翼托槽侧的平均移动速度是1.00 mm/月，差异无统计学意义（t=0.70，P=0.48）。结论3M SmartClip自锁托槽与Gemini MBT双翼托槽滑动法关闭间隙速度没有明显差异。

Clinical comparison of space closure with sliding mechanism between self ligating bracket and twin brackets

Objective To compare the the rate of en?masse space closure with sliding mechanics between 3M Smart?Clip self?ligating brackets and 3M Gemini MBT twin brackets in the first premolar extraction patients. Methods 20 Class I malocclusion patients who need first premolar extraction treatment were selected. One arch side of the second pre?molar and first molar were bonded with 3M self?ligating brackets and the other side bonded with Gemini MBT twin brack?ets. After leveling and alignment, 0.48 mm × 0.64 mm (0.019 inch × 0.025 inch) stainless steel wire and nickel titanium coil springs were used to close the space. An average rate of space closure per month (mm/month) was calculated in each side. Results The median rates of tooth movement for the SmartClip bracket side (1.03 mm per month) and the Gemini MBT twin brackets side (1.00 mm per month) were not significantly different (t=0.70, P=0.48). Conclusion There was no significant difference in the rate of en?masse space closure between SmartClip brackets and Gemini MBT twin brackets.