Department of Endodontics, Sapienza University of Rome, Rome, Italy.
J Endod. 2011 Sep;37(9):1293-5. doi: 10.1016/j.joen.2011.05.023. Epub 2011 Jul 16.
The aim of the present study was to evaluate the bending properties of Hyflex instruments, which exhibit a lower percent in weight of nickel (52 Ni %wt) and compare them with other commercially available nickel-titanium (NiTi) rotary instruments.
Ten instruments with tip size 25, 0.06 taper of each of the following NiTi rotary instrumentation techniques were selected for the study: Hyflex, EndoSequence, ProFile, Hero, and Flexmasters. All instruments from each group were tested for stiffness by comparing their bending moment when they attained a 45-degree bend. Experimental procedures strictly followed testing methodology described in ISO 3630-1. All data were recorded and subjected to statistical evaluation by using analysis of variance test. Statistical significance was set at P < .05).
Statistical analysis of the data revealed that Hyflex files were found to be the most flexible instruments, with a significant difference (P < .05) in comparison with the other instruments. Among the other files, a significant difference has been reported for EndoSequence instruments compared with ProFile, Hero, and FlexMaster (P < .05), whereas no significant differences have been reported among those 3 files (P > .05).
Results of the present study have illustrated an increased flexibility of the new NiTi alloy over conventional NiTi alloy, and they highlight the potential of the new manufacturing process.
本研究的目的是评估 Hyflex 器械的弯曲性能，该器械的镍含量（52Ni%wt）较低，并将其与其他市售镍钛（NiTi）旋转器械进行比较。
选择每种规格为 25、0.06 锥度的以下镍钛旋转器械技术的 10 个器械进行研究：Hyflex、EndoSequence、ProFile、Hero 和 Flexmasters。每组的所有器械均通过比较其达到 45 度弯曲时的弯曲力矩来测试其刚度。实验程序严格遵循 ISO 3630-1 中描述的测试方法。记录所有数据，并通过方差分析检验进行统计评估。统计显著性设为 P<.05）。
数据分析显示，Hyflex 锉是最灵活的器械，与其他器械相比有显著差异（P<.05）。在其他锉中，与 ProFile、Hero 和 FlexMaster 相比，EndoSequence 器械有显著差异（P<.05），而这 3 种器械之间无显著差异（P>.05）。
本研究结果表明，新型镍钛合金的柔韧性高于传统镍钛合金，并强调了新型制造工艺的潜力。
