Impact of Peracetic Acid on the Dynamic Cyclic Fatigue of Heat-Treated Nickel-Titanium Rotary Endodontic Instrument

Peracetic acid (PAA) is widely used as a sterilizing/disinfecting agent, and, in endodontics, it has been introduced promising irrigant root canal treatment. It at different concentrations to achieve various functions. However, endodontic instruments contact with PAA of certain concentration may affect their fatigue resistance. Therefore, the aim this study was investigate impact on cyclic resistance three commercial heat-treated nickel-titanium (NiTi) rotary files. Three types NiTi files were selected: One Curve (OC), ProTaper Gold (PTG), and Wave (WOG). Each type divided into subgroups (n = 6 for each file type): (1) untreated instruments; (2) immersed 0.002% PAA; (3) 0.35% PAA. The performance tested simulated canal. number cycles fracture (NCF) determined assess Independent sample t-test applied compare treated within subgroup its respective control group, one-way ANOVA comparison among main groups. All revealed significant decline after exposure except PTG ( P = 0.209 ). After higher (0.35% PAA), dramatic reduction demonstrated by all Before PAA, displayed highest resistance, followed WOG, while OC showed lowest Exposure heated-treated relatively high or low adversely affects best can be disinfected clinical purpose.