口腔正畸排齐阶段采用Laceback技术或弹力牵引对正畸效果的影响

Effect of Laceback technique or elastic traction on orthodontics during orthodontic alignment

目的:对比Laceback或轻弹力牵引在口腔正畸排齐阶段对牙列的影响及正畸效果的影响。方法:纳入拔除4个第一前磨牙病人44例,应用MBT直丝弓矫正器进行矫治,应用随机数字表法均分为2组,对照组应用轻弹力牵引尖牙,观察组应用Laceback牵引尖牙。对比2组牙列移动情况及疗程时间。结果:观察组尖牙牙尖远移距离明显长于对照组,尖牙倾斜度变化明显小于对照组,疗程时间明显长于对照组(P<0.01);2组治疗后尖牙间宽度均明显增加,仅对照组治疗后尖牙旋转度明显下降(P<0.01)。结论:口腔正畸排齐阶段采用Laceback技术对尖牙的控制更稳定,但排齐时间更长。

Objective:To compare the effects between Laceback and light elastic traction on dentition and orthodontics during orthodontic alignment.Methods:Forty four patients with extracting four first premolars were treated with MBT straight wire,and divided into the observation group and control group according to random digit table method.The observation group and control group were treated with Laceback and light elastic traction,respectively.The teeth movement and treatment time between two groups were compared.Results:The moving distance of canine,tilt change of canine and treatment time in observation group were longer,less and longer than those in control group,respectively(P<0.01).After treatment,the intercanine width in two groups increased,the canine rotation in control group decreased,and the difference of which was statistically significant(P<0.01).Conclusions:During aligning stage of canine traction,Laceback controlling canine is more stable,but its alignment time is longer.