Özyürek Taha, Keskin Neslihan Büşra, Furuncuoğlu Fatma, İnan Uğur
Department of Endodontics, Ondokuz Mayıs University Faculty of Dentistry, Samsun, Turkey.
Balgat Oral and Dental Health Center, Ankara, Turkey.
Restor Dent Endod. 2017 Aug;42(3):224-231. doi: 10.5395/rde.2017.42.3.224. Epub 2017 Aug 3.
To determine the actual revolutions per minute (rpm) values and compare the cyclic fatigue life of Reciproc (RPC, VDW GmbH), WaveOne (WO, Dentsply Maillefer), and TF Adaptive (TFA, Axis/SybronEndo) nickel-titanium (NiTi) file systems using high-speed camera.
Twenty RPC R25 (25/0.08), 20 WO Primary (25/0.08), and 20 TFA ML 1 (25/0.08) files were employed in the present study. The cyclic fatigue tests were performed using a dynamic cyclic fatigue testing device, which has an artificial stainless steel canal with a 60° angle of curvature and a 5-mm radius of curvature. The files were divided into 3 groups (group 1, RPC R25 [RPC]; group 2, WO Primary [WO]; group 3, TF Adaptive ML 1 [TFA]). All the instruments were rotated until fracture during the cyclic fatigue test and slow-motion videos were captured using high-speed camera. The number of cycles to failure (NCF) was calculated. The data were analyzed statistically using one-way analysis of variance (ANOVA, < 0.05).
The slow-motion videos were indicated that rpm values of the RPC, WO, and TFA groups were 180, 210, and 425, respectively. RPC (3,464.45 ± 487.58) and WO (3,257.63 ± 556.39) groups had significantly longer cyclic fatigue life compared with TFA (1,634.46 ± 300.03) group ( < 0.05). There was no significant difference in the mean length of the fractured fragments.
Within the limitation of the present study, RPC and WO NiTi files showed significantly longer cyclic fatigue life than TFA NiTi file.
使用高速摄像机确定Reciproc（RPC，VDW GmbH公司）、WaveOne（WO，登士柏迈尔菲尔公司）和TF Adaptive（TFA，Axis/SybronEndo公司）镍钛（NiTi）锉系统的实际每分钟转速（rpm）值，并比较其循环疲劳寿命。
本研究使用了20支RPC R25（25/0.08）、20支WO Primary（25/0.08）和20支TFA ML 1（25/0.08）锉。循环疲劳试验使用动态循环疲劳测试装置进行，该装置有一个曲率为60°、曲率半径为5毫米的人工不锈钢根管。锉被分为3组（第1组，RPC R25 [RPC]；第2组，WO Primary [WO]；第3组，TF Adaptive ML 1 [TFA]）。在循环疲劳试验中，所有器械旋转直至断裂，并用高速摄像机拍摄慢动作视频。计算失效循环次数（NCF）。数据采用单因素方差分析进行统计学分析（α < 0.05）。
慢动作视频显示，RPC、WO和TFA组的rpm值分别为180、210和425。与TFA组（1,634.46 ± 300.03）相比，RPC组（3,464.45 ± 487.58）和WO组（3,257.63 ± 556.39）的循环疲劳寿命明显更长（α < 0.05）。断裂碎片的平均长度没有显著差异。
在本研究的局限性内，RPC和WO NiTi锉的循环疲劳寿命明显长于TFA NiTi锉。
