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目的 探讨两种镍钛根管预备器械(ProTaper与Hero642)预备"S"形树脂根管的成形效果.方法 将30个"S"形树脂根管模型分为3组,分别使用机用ProTaper(A组)、Hero642(B组)及ProTaper联合Hero642(C组)预备根管.使用扫描仪扫描获取根管图像,使用计算机软件测量预备后根管内、外侧树脂去除量和根管宽度.结果 对比相同型号的器械对根尖部弯曲内侧、根尖孔外侧壁树脂去除量,C组与A组差异有统计学意义(P＜0.05),C组对根管内外侧壁的预备较均匀,预备后的根管宽度从根管口到根尖逐渐减小,优于B组预备的根管锥度.结论 ProTaper联合Hero642预备"S"形树脂根管时能在维持根管原形的基础上形成锥度良好的管形.

Objective To evaluate the shaping ability of two nickel-titanium rotary systems(ProTaper and Hero642)in simulated S-shaped canals.Methods Thirty simulated S-shaped canals were randomly divided into three groups and prepared by ProTaper,Hero642,ProTaper combined with Hero642 respectively.All the canals were scanned before and after instrumentation,and the amount of material removed in the inner and outer wall and the canal width after instrumentation were measured with a computer image analysis program.Results There was significant difference in the amount of material removed at the inner side of apical curvature and outer side of apex between ProTaper combined with Hero642 and ProTaper files ( P＜0.05)at the same tip size.The inner and outer wall of the canals were evenly prepared by ProTaper combined with Hero642,and the taper of canals were better than those prepared by Hero642.Conclusions ProTaper combined with Hero 642 had better shaping ability to maintain the original shape and could create good taper canals in the simulated S-shaped canal model.