Tepel J, Schäfer E, Hoppe W
Polyklinik für Zahnerhaltung A, Münster, Germany.
J Endod. 1995 Aug;21(8):418-21. doi: 10.1016/S0099-2399(06)80828-9.
Cutting efficiency of 24 different types of endodontic hand instruments, which are primarily designed for a rotary (reaming) working action, was investigated under standardized conditions. With a computer-driven testing device, resin specimens with simulated cylindrical canals were instrumented using a defined working motion simulating the clinical use of the instruments. Maximum penetration depth was the criterion for cutting efficiency. Sample size was 12 instruments for each type and size (#25 and #35). Nitinol K-files showed the least cutting efficiency. Stainless steel reamers and especially K-files showed better cutting efficiency than Nitinol K-files. Flexible stainless steel instruments displayed the best results. With regard to cutting efficiency, flexible stainless steel instruments were clearly superior to stainless steel reamers and K-files, and especially to Nitinol K-files.
在标准化条件下，对主要设计用于旋转（扩孔）工作动作的24种不同类型的根管治疗手动器械的切割效率进行了研究。使用计算机驱动的测试装置，采用模拟器械临床使用的特定工作动作，对具有模拟圆柱形根管的树脂标本进行器械操作。最大穿透深度作为切割效率的标准。每种类型和尺寸（#25和#35）的样本量为12支器械。镍钛合金K锉的切割效率最低。不锈钢扩孔钻，尤其是K锉，比镍钛合金K锉显示出更好的切割效率。柔性不锈钢器械显示出最佳结果。在切割效率方面，柔性不锈钢器械明显优于不锈钢扩孔钻和K锉，尤其优于镍钛合金K锉。
