Koçak Sibel, Şahin Faruk Furkan, Özdemir Olcay, Koçak Mustafa Murat, Sağlam Baran Can
Department of Endodontics, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Zonguldak, Turkey.
Private Dental Clinic, Istanbul, Turkey.
J Dent Res Dent Clin Dent Prospects. 2021 Summer;15(3):172-177. doi: 10.34172/joddd.2021.029. Epub 2021 Aug 25.
This study aimed to compare the cyclic fatigue resistance of ProTaper Next, Hyflex CM, 2Shape, and TF-Adaptive nickel-titanium endodontic file systems with various alloy properties and production methods and investigate the fractured cross-sectional surface of files due to cyclic fatigue by scanning electron microscopy (SEM). A total of 120 instruments were used (n=30). For standardization, #25/.06 apical diameter and taper angle were selected for each file system. The experiment of files was subjected to a static cyclic fatigue model. The time for files' failure was recorded with a digital chronometer and multiplied by the rotation speed to calculate the number of cycles. Kolmogorov-Smirnov, one-way ANOVA, and post hoc Bonferroni analysis were used for statistical analysis. Statistical significance was set at < 0.05. The number of cycles for the failure of files was compared between the groups, and significant differences were found ( < 0.05). The number of cycles for instrument failure was recorded from the highest to the lowest as follows: Hyflex CM, TF-Adaptive, ProTaper Next, and 2Shape. The files were fractured at different average numbers of cycles in an artificial canal in all the groups. The Hyflex CM demonstrated better cyclic fatigue resistance than TF Adaptive, ProTaper Next, and 2Shape file systems. Factors such as production patterns, alloy properties, and the phase in which the files were produced might affect the lifespan of file systems.
本研究旨在比较具有不同合金性能和生产方法的ProTaper Next、Hyflex CM、2Shape和TF-Adaptive镍钛根管锉系统的抗循环疲劳性能，并通过扫描电子显微镜（SEM）研究锉因循环疲劳而断裂的横截面。总共使用了120根器械（n = 30）。为实现标准化，为每个锉系统选择了#25/.06根尖直径和锥度角。锉的实验采用静态循环疲劳模型。用数字计时器记录锉失效的时间，并乘以转速以计算循环次数。采用Kolmogorov-Smirnov检验、单因素方差分析和事后Bonferroni分析进行统计分析。统计学显著性设定为<0.05。比较了各组之间锉失效的循环次数，发现存在显著差异（<0.05）。器械失效的循环次数从高到低记录如下：Hyflex CM、TF-Adaptive、ProTaper Next和2Shape。在所有组中，锉在人工根管中以不同的平均循环次数断裂。Hyflex CM表现出比TF Adaptive、ProTaper Next和2Shape锉系统更好的抗循环疲劳性能。生产模式、合金性能以及锉生产时的相态等因素可能会影响锉系统的使用寿命。
