三种镍钛器械对根管预备效果的研究

Research on Three Types of Nickel-titanium Instruments Have the Prepared Effect on Root Canal

目的:比较机用M3-Pro、Mtwo和WaveOne三种镍钛器械的根管预备效果。方法:选取45颗近期拔除的下颌第一前磨牙并随机分为A、B、C三组,分别采用三种不同的机用器械进行预备,将根管预备过程中外溢出根尖孔的碎屑进行离心、干燥并称重,对三组的碎屑以及玷污层进行综合评分。结果:C组产生的碎屑量明显多于A组及B组,差异有统计学意义(P<0.05),用扫描电镜观察根管壁的各个部位,相较于根尖部各组冠1/3处评分低。在碎屑评分中,各组同一部位进行比较时,A组评分低于B组及C组,A组与B组间差异无统计学意义(P>0.05)。结论:使用M3-Pro镍钛器械和Mtwo镍钛器械完成的根管预备,根尖孔的碎屑溢出量及根管的清理效果优于WaveOne组,且M3-Pro镍钛器械更加经济实惠。

Objective：Compare the prepared effect of root canal of machine M3-Pro,Mtwo and WaveOne nickel-titanium instruments.Methods：Select the latest pulled 45 mandibular first premolars and random divided into Group A,B,C,carry out the preparation separately by M3-Pro,Mtwo and WaveOne instruments,adopt the centrifugation and drying and weigh for the debris,which are overflowed from the apical foramen in the root canal preparation process;carry out the observation for the cleaning effect of prepared root canal wall by the scanning electron microscope,make the marking for the debris and smear layer.Results：The amount of debris produced in group C was more than that in group A and group B,and there was a significant difference.There was no significant difference in the amount of debris produced in A and B groups.Scanning electron microscope（SEM）was used to observe the parts of the root canal which has the lower score than the root tips at 1/3 position of each coronal group.Group A has the lower score than group B and group C in the debris marking when carrying out the comparison for the same parts of all groups.C group has a significant difference than other two groups,group A and group B have not the significant difference.Group A,B and C have not been the significant difference in the smear layer marking.Conclusion：The root canal preparation with M3-pro Ni-Ti apparatus and Mtwo Ni-Ti instrument,the debris overflow of apical foramen and the cleaning effect of root canal were better than that of WaveOne group,and M3-Pro nickel-titanium instrument is more cost-effective.