Al-Nasrawi Suhad Jabbar Hamed, Ayad Jaber Zuha, Talib Al-Quraine Nibrass, Imhemed Aljdaimi Abtesam, Jabbar Abdul-Zahra Al-Hmedat Sattar, Zidan Saleh, Haider Julfikar
Department of Conservative Dentistry, Faculty of Dentistry, University of Kufa, Najaf, Iraq.
College of Dentistry and Oral Surgery, Alasmarya of Dental Materials, Faculty of Dentistry, Sebha University, Sebha, Libya.
Int J Dent. 2021 Jan 19;2021:6676005. doi: 10.1155/2021/6676005. eCollection 2021.
Peracetic acid (PAA) is widely used as a sterilizing/disinfecting agent, and, in endodontics, it has been introduced as a promising irrigant in root canal treatment. It has been used at different concentrations to achieve various functions. However, endodontic instruments in contact with PAA of a certain concentration may affect their fatigue resistance. Therefore, the aim of this study was to investigate the impact of PAA on the cyclic fatigue resistance of three commercial heat-treated nickel-titanium (NiTi) rotary files. Three types of heat-treated NiTi rotary files were selected: One Curve (OC), ProTaper Gold (PTG), and Wave One Gold (WOG). Each type was divided into three subgroups ( = 6 for each file type): (1) untreated instruments; (2) files immersed in 0.002% PAA; and (3) files immersed in 0.35% PAA. The performance of each file type was tested in a simulated canal. The number of cycles to fracture (NCF) was determined to assess cyclic fatigue resistance of the files. Independent sample -test was applied to compare each treated file within a subgroup with its respective control group, and one-way ANOVA was used for comparison among the main groups. All types of tested files revealed a significant decline in the cyclic fatigue resistance after exposure to 0.002% PAA except the PTG (=0.209). After exposure of the files to a higher concentration (0.35% PAA), a dramatic reduction was demonstrated by all the groups. Before and after exposure of the files to PAA, PTG displayed the highest cyclic fatigue resistance, followed by the WOG, while the OC showed the lowest resistance. Exposure of heated-treated NiTi files to PAA in a relatively high or low concentration adversely affects the cyclic fatigue resistance. The PTG files demonstrated the best performance among the tested types and can be disinfected with 0.002% PAA for clinical purpose.
过氧乙酸（PAA）被广泛用作消毒剂，在牙髓病学中，它已被引入作为根管治疗中有前景的冲洗剂。它已被用于不同浓度以实现各种功能。然而，与一定浓度的PAA接触的牙髓器械可能会影响其抗疲劳性。因此，本研究的目的是调查PAA对三种商用热处理镍钛（NiTi）旋转锉循环抗疲劳性的影响。选择了三种类型的热处理NiTi旋转锉：One Curve（OC）、ProTaper Gold（PTG）和Wave One Gold（WOG）。每种类型分为三个亚组（每种锉类型n = 6）：（1）未处理的器械；（2）浸入0.002% PAA中的锉；（3）浸入0.35% PAA中的锉。每种锉类型的性能在模拟根管中进行测试。确定断裂循环次数（NCF）以评估锉的循环抗疲劳性。应用独立样本t检验比较亚组内每个处理过的锉与其各自的对照组，并且使用单因素方差分析在主要组之间进行比较。除PTG外（P = 0.209），所有测试类型的锉在暴露于0.002% PAA后循环抗疲劳性均显著下降。在锉暴露于更高浓度（0.35% PAA）后，所有组均显示出显著降低。在锉暴露于PAA之前和之后，PTG表现出最高的循环抗疲劳性，其次是WOG，而OC表现出最低的抗疲劳性。将热处理的NiTi锉暴露于相对高或低浓度的PAA会对循环抗疲劳性产生不利影响。在测试类型中，PTG锉表现出最佳性能，并且出于临床目的可用0.002% PAA进行消毒。
