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The influence of the manufacturing process of rotary files on the shaping of L-shaped canals

机译：旋转锉的制造工艺对L形管的成形的影响

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Background . The nickel-titanium alloy used in the production of nickel-titanium files contains approx. 56% nickel and 44% titanium by weight. To improve the properties of nickel-titanium files, the manufacturers introduce some innovations in the production process. Their purpose is primarily to decrease the stiffness of the instruments while increasing the resistance to cyclic fatigue, which reduces the risk of file separation. One of the most popular processes is the heat treatment of the nickel-titanium alloy. Objectives . The aim of the research was to determine the influence of the manufacturing process of rotary files on the shaping of L-shaped canals. Material and Methods . Fifty L-shaped resin canals were instrumented (10/group) with ProTaper Universal ?, ProTaper Next?, Hyflex CM?, Hyflex EDM?, or WaveOne Gold? files, with the same apical size of 25. Each L-shaped resin canal was photographed both before and after instrumentation. Differences between the change of the working length and apical transportation were analyzed statistically. Results . The smallest mean loss of the working length was observed after instrumentation with Hyflex CM files. Statistically significant differences in the working length were found between ProTaper Universal and Hyflex CM (p = 0.0032), ProTaper Universal and Hyflex EDM (p = 0.021), and ProTaper Universal and WaveOne Gold (p = 0.0112) files. The lowest apical transportation was noted in the case of WaveOne Gold files. In terms of apical transportation, statistically significant differences were observed between ProTaper Universal and WaveOne Gold files (p = 0.0254). Shaping Lshaped canals with the ProTaper Universal file system resulted in the greatest changes in the working length (x = 0.35 mm) and apical transportation (x = 0.034 mm). Conclusion . The study, with its limitations, shows that in the files whose nickel-titanium alloy was subjected to a thermal treatment process, a smaller loss of the working length and lower values of apical transportation were observed.
机译：背景 。用于生产镍钛锉的镍钛合金包含约以重量计，镍为56％，钛为44％。为了改善镍钛锉的性能，制造商在生产过程中引入了一些创新。它们的目的主要是在降低器械刚度的同时增加对循环疲劳的抵抗力，从而降低文件分离的风险。最受欢迎的工艺之一是镍钛合金的热处理。目标。该研究的目的是确定旋转锉的制造过程对L形运河的形状的影响。材料与方法 。用ProTaper Universal？，ProTaperNext？，Hyflex CM？，Hyflex EDM？或WaveOne Gold？（共50个）对五十个L形树脂管进行了器械检查（每组10个）。锉刀，其根尖大小相同，为25。在安装器械之前和之后，对每个L形树脂管进行拍照。统计分析工作长度变化与根尖运输之间的差异。结果。使用Hyflex CM锉后，观察到最小的工作长度平均损失。在ProTaper Universal和Hyflex CM（p = 0.0032），ProTaper Universal和Hyflex EDM（p = 0.021）以及ProTaper Universal和WaveOne Gold（p = 0.0112）文件之间，发现工作长度存在统计学差异。在WaveOne Gold锉刀的情况下，发现顶端的传输最低。在根尖运输方面，在ProTaper Universal和WaveOne Gold文件之间观察到统计学上的显着差异（p = 0.0254）。使用ProTaper Universal锉刀系统对L形运河进行整形会导致工作长度（x = 0.35 mm）和根尖运输（x = 0.034 mm）的最大变化。结论。这项研究有其局限性，表明在对其进行了镍钛合金热处理的锉刀中，观察到工作长度的损失较小，而顶端的转运值较低。

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