Experimental evaluation of cyclic fatigue resistance of four different nickel-titanium instruments after immersion in sodium hypochlorite and/or sterilization.
Experimental evaluation of cyclic fatigue resistance of four different nickel-titanium instruments after immersion in sodium hypochlorite and/or sterilization.
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DOI：
10.1590/1679-775720130083
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发表时间：
2013-11
期刊：
影响因子：
--
通讯作者：
Guldas HE
中科院分区：
文献类型：
--
作者：
Bulem ÜK;Kececi AD;Guldas HE
NiTi手术工具因扭转或弯曲疲劳（循环疲劳）而具有较高的分离风险。化学机械预备、清洁程序、化学消毒和灭菌导致根管器械的腐蚀，这可能会降低器械的抗断裂能力。 旨在评估NaOCl浸泡和高压蒸汽灭菌对ProFile、FlexMaster、Mtwo和TwistedFiles NiTi手术工具（头端尺寸25，0.06锥度，n=160）循环疲劳抗力的影响。将手术工具（每个亚组n=10）动态浸入NaOCl中;浸入NaOCl中并在1个高压灭菌器循环中灭菌;浸入NaOCl中并在高压灭菌器中灭菌5个循环，不浸入NaOCl中且不灭菌（对照组）。动态循环疲劳抗力进行了测试。对两组的失效循环数（NCF）进行统计学分析（P<0.05）。Kruskall-Wallis检验表明，受试器械之间的NCF存在显著差异（P=0.000）。Mtwo的平均NCF（556.75）高于Twisted File、Flexmaster和ProFile的平均NCF（分别为483.1、376.12、365.25）。NaOCl浸泡和高压灭菌对器械的NCF值无影响（P> 0.05）。受试NiTi手术工具的抗循环疲劳性不会受到NaOCl浸泡和高压蒸汽灭菌的不利影响。手术工具的生产过程（TwistedFiles）或设计（Twisted Files、FlexMaster、Mtwo和ProFile）可能会影响其循环疲劳抗力。
NiTi instruments have a high risk of separation due to torsional or flexural fatigue (cyclic fatigue). Chemomechanical preparation, cleaning procedures, chemical disinfection and sterilization cause the corrosion of endodontic instruments that may weaken the fracture resistance of the instruments. To assess the effects of NaOCl immersion and autoclave sterilization on the cyclic fatigue resistance of ProFile, FlexMaster, Mtwo and TwistedFiles NiTi instruments (tip size 25, 0.06 taper, n=160). The instruments (n=10 for each subgroup) were dynamically immersed in NaOCl; immersed in NaOCl and sterilized in one autoclave cycle; 5 cycles immersed in NaOCl and sterilized in autoclave and not immersed in NaOCl and not sterilized (control group). Dynamic cyclic fatigue resistance was tested. The number of cycles to failure (NCF) were statistically analyzed (P<0.05). Kruskall-Wallis test indicated significant differences among the tested instruments in terms of NCF (P=0.000). The mean NCF of Mtwo (556.75) was higher than that of the Twisted File, Flexmaster and ProFile, 483.1, 376.12, 365.25, respectively. NaOCl immersion and autoclave sterilization have no effect on the NCF values of the tested instruments (P>.05). Cyclic fatigue resistance of the tested NiTi instruments cannot be adversely affected by NaOCl immersion and autoclave sterilization. Production process (TwistedFiles) or design (Twisted Files, FlexMaster, Mtwo and ProFile) of the instruments can influence their cyclic fatigue resistance.
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影响因子：
4.2
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