Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Istanbul, Turkey.
Cekmekoy Oral and Dental Health Center, Istanbul, Turkey.
Int Endod J. 2018 May;51(5):549-555. doi: 10.1111/iej.12790. Epub 2017 May 28.
To compare the cyclic fatigue resistances of WaveOne Gold (Denstply Sirona, Ballaigues, Switzerland), WaveOne (Dentsply Sirona) and Reciproc (VDW, Munich, Germany) in interrupted reciprocation.
Three groups of 18 instruments each of WaveOne Gold Primary, WaveOne Primary and Reciproc R25 were subjected to cyclic fatigue tests in reciprocation and interrupted reciprocation. The instruments in group 1 were tested in reciprocation, whereas in groups 2 and 3, reciprocation was interrupted for 1 s in every 5 s and 10 s, respectively. Cyclic fatigue resistance was tested using dynamic test devices in stainless steel, curved canals (60°, r = 5 mm) until fracture, and the time to fracture values were recorded. The lengths of the fractured tips were also recorded, and fractured surfaces were examined with a scanning electron microscope (SEM). Data were evaluated by one-way analysis of variance and Tukey's tests.
The cyclic fatigue resistance of WaveOne Gold Primary was not affected by the interruptions (P > 0.05) and exhibited significantly greater cyclic fatigue resistance than WaveOne Primary and Reciproc R25 in all groups (P < 0.05). Interruptions reduced the cyclic fatigue resistance of WaveOne Primary and Reciproc R25 significantly (P < 0.05).
Interrupted reciprocation reduced the cyclic fatigue resistance of Reciproc R25 and WaveOne Primary. The cyclic fatigue resistance of WaveOne Gold Primary was greater than that of WaveOne Primary and was not dependent on the occurrence of interruptions.
比较往复运动中 WaveOne Gold（登士柏西诺德，瑞士）、WaveOne（登士柏西诺德）和 Reciproc（VDW，慕尼黑，德国）的循环疲劳强度。
将三组各 18 根的 WaveOne Gold Primary、WaveOne Primary 和 Reciproc R25 器械分别进行往复运动和间歇往复运动的循环疲劳试验。第 1 组的器械进行往复运动，而第 2 组和第 3 组的器械在每 5 秒和 10 秒分别中断 1 秒进行往复运动。使用动态测试设备在不锈钢、弯曲根管（60°，r=5mm）中测试循环疲劳强度，直至器械断裂，并记录断裂时间值。还记录了断裂尖端的长度，并使用扫描电子显微镜（SEM）检查了断裂表面。数据采用单因素方差分析和 Tukey 检验进行评估。
WaveOne Gold Primary 的循环疲劳强度不受中断的影响（P>0.05），并且在所有组中均表现出比 WaveOne Primary 和 Reciproc R25 更高的循环疲劳强度（P<0.05）。中断显著降低了 WaveOne Primary 和 Reciproc R25 的循环疲劳强度（P<0.05）。
间歇往复运动降低了 Reciproc R25 和 WaveOne Primary 的循环疲劳强度。WaveOne Gold Primary 的循环疲劳强度大于 WaveOne Primary，且不受中断的影响。
