Effect of autoclave sterilization on the cyclic fatigue resistance of thermally treated Nickel-Titanium instruments.
Effect of autoclave sterilization on the cyclic fatigue resistance of thermally treated Nickel-Titanium instruments.
复制标题
高压灭菌器对热处理镍钛器械的循环疲劳性能的影响。
DOI：
10.1111/iej.12550
复制
发表时间：
2016
影响因子：
5
通讯作者：
M. Haapasalo
中科院分区：
文献类型：
--
作者：
D. Zhao;Ya Shen;Bin Peng;M. Haapasalo
目的
旨在比较HyFlex CM、Twisted Files（TF）、K3 XF、Race和K3的循环疲劳抗力，并评价高压灭菌器灭菌对这些工具循环前后循环疲劳抗力的影响。
方法
选择了5种具有相似尺寸30、0.06锥度的NiTi手术工具：HyFlex CM、TF、K3 XF、Race和K3。在曲率为60°、半径为3 mm的模拟髓腔中测试锉。确定每件手术工具的失效循环次数，以评价循环疲劳抗力。将每种器械随机分为4组：第1组（n = 20），未灭菌器械;第2组（n = 20），预灭菌器械经过10个周期的高压蒸汽灭菌;第3组（n = 20），在第1组确定的平均失效循环次数的25%、50%和75%下对受试器械进行灭菌，然后循环至失效;第4组（n = 20），器械以与第3组相同的方式循环，但不进行灭菌。用扫描电子显微镜（SEM）对器械的断裂面进行了观察。
结果
在未灭菌组1中，HyFlex CM、TF和K3 XF的循环疲劳抗力显著高于Race和K3（P < 0.05）。高压蒸汽灭菌显著提高了HyFlex CM和K3 XF的MCF（P < 0.05）。SEM检查显示所有手术工具均出现典型的循环疲劳断裂模式。
结论
由新型热处理合金制成的HyFlex CM、TF和K3 XF手术工具比Race和K3更耐疲劳失效。高压灭菌延长了HyFlex CM和K3 XF的循环疲劳寿命。
AIM
To compare the cyclic fatigue resistance of HyFlex CM, Twisted Files (TF), K3XF, Race, and K3, and evaluate the effect of autoclave sterilization on the cyclic fatigue resistance of these instruments both before and after the files were cycled.
METHODOLOGY
Five types of NiTi instruments with similar size 30, .06 taper were selected: HyFlex CM, TF, K3XF, Race and K3. Files were tested in a simulated canal with a curvature of 60° and a radius of 3 mm. The number of cycles to failure of each instrument was determined to evaluate cyclic fatigue resistance. Each type of instruments was randomly divided into four experimental groups: group 1 (n = 20), unsterilized instruments; group 2 (n = 20), pre-sterilized instruments subjected to 10 cycles of autoclave sterilization; group 3 (n = 20), instruments tested were sterilized at 25%, 50% and 75% of the mean cycles to failure as determined in group 1, and then cycled to failure; group 4 (n = 20), instruments cycled in the same manner as group 3 but without sterilization. The fracture surfaces of instruments were examined by scanning electron microscopy (SEM).
RESULTS
HyFlex CM, TF and K3XF had significantly higher cyclic fatigue resistance than Race and K3 in the unsterilized group 1 (P < 0.05). Autoclave sterilization significantly increased the MCF of HyFlex CM and K3XF (P < 0.05) both before and after the files were cycled. SEM examination revealed a typical pattern of cyclic fatigue fracture in all instruments.
CONCLUSIONS
HyFlex CM, TF and K3XF instruments composed of new thermal-treated alloy were more resistant to fatigue failure than Race and K3. Autoclaving extended the cyclic fatigue life of HyFlex CM and K3XF.