Experimental Evaluation on the Influence of Autoclave Sterilization on the Cyclic Fatigue of New Nickel-Titanium Rotary Instruments
Experimental Evaluation on the Influence of Autoclave Sterilization on the Cyclic Fatigue of New Nickel-Titanium Rotary Instruments
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DOI：
10.1016/j.joen.2011.10.017
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发表时间：
2012-02-01
影响因子：
4.2
通讯作者：
Gambarini, Gianluca
中科院分区：
文献类型：
--
作者：
Plotino, Gianluca;Costanzo, Alberto;Gambarini, Gianluca
前言：本研究的目的是评价高压釜灭菌对传统镍钛（NiTi）合金和新型镍钛（NiTi）合金旋转根管器械抗循环疲劳性能的影响。方法：4个相同尺寸（针尖直径0.40 mm，固定）的镍钛旋转根管器械。04锥度)选择：K3， Mtwo， Vortex和K3 XF原型。每组再分为未灭菌器械和灭菌器械2个亚组。灭菌后的仪器进行了10次高压灭菌。每个亚组12个文件进行了循环疲劳抗力测试。计算各组骨折失败循环数（NCF）和骨折尖端碎片长度的均值和标准差，并对数据进行统计学分析（P < 0.05）。结果：各类型锉未灭菌与灭菌器械结果比较，仅灭菌与未灭菌K3XF锉（762 NCF与651 NCF）差异有统计学意义（P < 0.05）。由于灭菌周期，其他仪器在平均NCF方面没有显着差异（P b>.05） （K3, 424与439 NCF； m2, 409与419 NCF； Vortex， 454与480 NCF）。不同组间比较，K3 XF（无菌组和未灭菌组）的平均NCF显著高于其他各组（P < 0.05）。结论：除了旋转器械的K3 XF原型具有显著的抗循环疲劳性能外，反复的高压灭菌器灭菌似乎不会影响NiTi根管器械的力学性能。[J] end2012;38:222-225]
Introduction: The purpose of this study was to evaluate the effect of autoclave sterilization on cyclic fatigue resistance of rotary endodontic instruments made of traditional and new nickel-titanium (NiTi) alloys. Methods: Four NiTi rotary endodontic instruments of the same size (tip diameter 0.40 mm and constant .04 taper) were selected: K3, Mtwo, Vortex, and K3 XF prototypes. Each group was then divided into 2 subgroups, unsterilized instruments and sterilized instruments. The sterilized instruments were subjected to 10 cycles of autoclave sterilization. Twelve files from each different subgroup were tested for cyclic fatigue resistance. Means and standard deviations of number of cycles to failure (NCF) and fragment length of the fractured tip were calculated for each group, and data were statistically analyzed (P < .05). Results: Comparing the results between unsterilized and sterilized instruments for each type of file, differences were statistically significant (P < .05) only between sterilized and unsterilized K3XF files (762 versus 651 NCF). The other instruments did not show significant differences (P > .05) in the mean NCF as a result of sterilization cycles (K3, 424 versus 439 NCF; Mtwo, 409 versus 419 NCF; Vortex, 454 versus 480 NCF). Comparing the results among the different groups, K3 XF (either sterilized or not) showed a mean NCF significantly higher than all other files(P < .05). Conclusions: Repeated cycles of autoclave sterilization do not seem to influence the mechanical properties of NiTi endodontic instruments except for the K3 XF prototypes of rotary instruments that demonstrated a significant increase of cyclic fatigue resistance. (J Endod 2012;38:222-225)