固定位置Er,Cr:YSGG激光对根管壁玷污层去除效果的研究

Removal efficiency of smear layer on root cannal by Er,Cr:YSGG laser with fixed position

目的光纤头固定在根管入口处比较不同功率的Er,Cr:YSGG激光活化荡洗(LAI)对根管壁上玷污层的去除效果。方法收集48颗无龋坏单根管恒前牙,按处理方法的不同随机均分为4组(n=12):0.5 W LAI组、1.0 W LAI组、超声荡洗组和注射冲洗组,冲洗结束后将牙纵向劈开分成两份,随机选取其中一份进行电镜扫描,分别扫描根管壁的冠部1/3、根中1/3、根尖1/3,并对残留玷污层用Hülsmann的评分系统进行评分,比较4组冲洗方法对玷污层去除效果。结果在冠部1/3,1.0 W LAI组清除玷污层比注射冲洗组和超声荡洗组更为有效(P<0.05),在根中1/3和根尖1/3,1.0 W LAI组与超声荡洗组之间差异无统计学意义(P>0.05),但比其他两组更为有效(P<0.05)。结论光纤头置于根管入口处且功率为1.0 W的Er,Cr:YSGG激光LAI可有效去除玷污层,且优于0.5 W LAI组和注射冲洗组,并在冠部1/3优于超声荡洗组。

Objective To compare the efficacy of laser-activated irrigation(LAI)on the removal of smear layer with different power settings when the fiber tip in the canal entrance.Methods 48 extracted single-rooted teeth were randomly divided into 4 groups(n=12)according to the final irrigation techniques:0.5 W LAI,1.0W LAI,ultrasonic and needle irrigation.After the final irrigation,the teeth were split longitudinally into 2 parts and observed under a scanning electron microscope.Images were taken at the coronal,middle and apical thirds of the teeth at a magnification of 1000×and were scored in the presence of the smear layer using the Hülsmann scoring system.Results In the coronal third,1.0 W LAI group was significantly more effective in removing SL than the ultrasonic and needle irrigation groups(P<0.05).In the apical and middle thirds,1.0 W LAI and ultrasonic group were comparable on the removal of the smear layer(P>0.05).1.0 W LAI group was better than the other groups,and the difference was significant(P<0.05)Conclusion 1.0 W LAI with Er,Cr:YSGG laser in canal entrance is comparable on removal of the smear layer and is better than needle irrigation and 0.5 W LAI,and is better than ultrasonic group in the coronal third.