周围温度和器械进入角度对两种镍钛单文件器械循环疲劳阻力的影响。
Influence of surrounding temperature and angle of file access on cyclic fatigue resistance of two single file nickel-titanium instruments.
机构信息
Department of General Surgery and Medical - Surgical Specialties, University of Catania, Catania, Italy.
出版信息
Aust Endod J. 2021 Aug;47(2):260-264. doi: 10.1111/aej.12473. Epub 2020 Dec 4.
The purpose of this study was to evaluate the influence of surrounding temperature and angle of file access on cyclic fatigue resistance of F6 SkyTaper (F6ST) and One Curve (OC). 120 new files #25.06 were tested at two insertion angles (0° and 20°) at room (20°C ± 1°C) and body (35°C ± 1°C) temperatures in a 16-mm stainless steel artificial canal (60° curvature and 5-mm radius), using a customised device. Cyclic fatigue resistance was expressed as time to fracture (TtF) in seconds. Data were analysed statistically (P < 0.05). All instruments exhibited lower TtF at 35°C (P < 0.05). An access of 20° did not significantly influence the TtF of tested instruments, independently from the temperature. OC exhibited higher TtF of F6ST at 20°C with a 20° inclination (P < 0.05). Under the present conditions, F6ST and OC showed a significant reduction of cyclic fatigue resistance at body temperature. A file inclined insertion did not affect the cyclic fatigue resistance of tested instruments at both temperatures.
本研究旨在评估周围温度和器械进入角度对 F6 SkyTaper（F6ST）和 One Curve（OC）的循环疲劳强度的影响。在室温（20°C±1°C）和体温（35°C±1°C）条件下，120 根新的 #25.06 器械以 0°和 20°的插入角在 16mm 不锈钢人工根管（60°弯曲度和 5mm 半径）中，使用定制设备，分别在 0°和 20°两个角度进行了测试。循环疲劳强度以断裂时间（TtF）表示，单位为秒。数据进行了统计学分析（P<0.05）。所有器械在 35°C 时的 TtF 均较低（P<0.05）。温度不变时，20°的进入角度并未显著影响测试器械的 TtF。OC 在 20°C 时，20°倾斜时的 TtF 高于 F6ST（P<0.05）。在本研究条件下，F6ST 和 OC 在体温下的循环疲劳强度明显降低。在两种温度下，器械倾斜插入均不会影响测试器械的循环疲劳强度。
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