3种往复旋转单支镍钛器械预备模拟弯曲根管的效果比较

目的：比较3种往复旋转单支镍钛器械预备模拟弯曲根管的切割能力和成形能力，为其临床应用提供参考。方法：选取30个单弯树脂模拟根管模块，随机分为Reciproc组、One file组和WaveOne组，每组10个模块。按厂家提供的使用说明预备模拟根管，记录根管预备时间、预备前后模块的质量差，测量根管弯曲角度的变化及镍钛器械中心定位能力。结果：WaveOne组的根管预备时间较其他2组长（P<0.05）；3组镍钛器械根管预备前后模块的质量差比较差异无统计学意义（P>0.05）；3组镍钛器械预备前后模拟根管弯曲角度的差值比较差异无统计学意义（P>0.05）。距离根尖孔5mm处，Reciproc组和One file组的中心定位能力优于WaveOne组（P<0.05）；在距离根尖孔6和7mm处，One file组的中心定位能力优于其他2组（P<0.05）。结论：WaveOne、Reciproc和One file3种往复旋转单支镍钛器械均可较好地保持模拟根管的原始形态。WaveOne预备根管的效率低于其他2组。One file在各段根管的中心定位能力均高于其他2组。

Comparison between three kinds of reciprocating nickel-titanium instruments in resin simulated canals

Objective: To compare the shaping and cutting capabilities of three kinds of nickel-titanium instruments in resin simulated root canals,and to provide the reference for their clinical application.Methods: A total of 30 simulated resin blocks were randomly divided into Reciproc,One file,and WaveOne groups(n=10).The preparation time,reduction in weight after preparation,the changes in canal curvature and centering capability were measured.Results: The preparation time in WaveOne group was longer than other two groups (P<0.05).The reduction in weight after preparation had no significantly difference in three groups(P>0.05). The changes of canal curvature among the three groups were not significantly different (P>0.05).At the 5 mm point,the centering capabilities in Reciproc and One file groups were significantly better than that in WaveOne group (P<0.05),and the centering capabilities in One file group were significantly better than those in other two groups at the 6 and 7 mm points(P<0.05).Conclusion: WaveOne,Reciproc,and One file can maintain the original canal curvature. The efficacy of WaveOne is lower than other two groups;One file exhibits superior centering capability in the preparation of canal compared with other two groups.