Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey.
Çorum Oral and Dental Health Centre, Çorum, Turkey.
Int Endod J. 2018 May;51(5):584-589. doi: 10.1111/iej.12846. Epub 2017 Sep 18.
To examine the cyclic fatigue resistances of R-Pilot, HyFlex EDM and PathFile NiTi glide path files in S-shaped artificial canals.
Twenty R-Pilot (12.5/.04), 20 HyFlex EDM (10/.05) and 20 PathFile (19/.02) single-file glide path files were included. Sixty files (n: 20/each) were subjected to static cyclic fatigue testing using double-curved canals until fracture occurred (TF). The number of cycles to fracture (NCF) was calculated by multiplying the rpm value by the TF. The length of the fractured fragment (FL) was determined by a digital microcaliper. Six samples of fractured files (n: 2/each) were examined by SEM to determine the fracture mode. The NCF and the FL data were analysed using one-way anova, post hoc Tamhane and Kruskal-Wallis tests using SPPS 21 software. The significance level was set at 5%.
In the double-curved canal, all the files fractured first in the apical curvature and then in the coronal curvature. The NCF values revealed that the R-Pilot had the greatest cyclic fatigue resistance, followed by the HyFlex EDM and PathFile in both the apical and coronal curvatures (P < 0.05).
R-Pilot NiTi glide path files, used in a reciprocating motion, had the greatest cyclic fatigue resistance amongst the tested NiTi glide path files in an artificial S-shaped canal.
研究 R-Pilot、HyFlex EDM 和 PathFile 镍钛锉在 S 形人工根管中的循环疲劳抗力。
纳入 20 根 R-Pilot（12.5/.04）、20 根 HyFlex EDM（10/.05）和 20 根 PathFile（19/.02）单锉根管预备锉。60 根锉（n：20/每种）在双曲人工根管中进行静态循环疲劳测试，直至发生断裂（TF）。断裂时的循环数（NCF）通过将 rpm 值乘以 TF 计算得出。断裂片段的长度（FL）用数字测微卡尺确定。对 6 个断裂锉的样本（n：2/每种）进行 SEM 检查，以确定断裂模式。使用 SPSS 21 软件的单因素方差分析、Tamhane 事后检验和 Kruskal-Wallis 检验对 NCF 和 FL 数据进行分析。显著性水平设定为 5%。
在双曲根管中，所有锉均先在根尖弯曲处断裂，然后在冠向弯曲处断裂。NCF 值表明，R-Pilot 在根尖和冠向弯曲处的循环疲劳阻力最大，其次是 HyFlex EDM 和 PathFile（P<0.05）。
在往复运动中使用的 R-Pilot 镍钛锉在 S 形人工根管中具有最大的循环疲劳阻力，在测试的镍钛锉中循环疲劳阻力最大。
