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Aim: The purpose of this study was to assess the effects of sodium hypochlorite (NaOCl) immersion and sterilization on the cyclic fatigue resistance of four heat-treated nickel-titanium (NiTi) rotary instruments. Materials and Methods: Two hundred and forty new nickel-titanium endodontic files were tested for cyclic fatigue resistance in simulated canals. 25/.06 Twisted Files (Sybron Endo, Orange, CA, USA), 25/.06 Hyflex CM (Coltene Whaledent, Cuyahoga Falls, OH), 25/~ Hyflex EDM (Coltene, Whaledent Pvt Ltd) and 25/.06 EdgeFile X3 (EdgeEndo, Albuquerque, NM, USA) files were divided into 4 subgroups (n = 15) for each brand. Subgroup 1 (control group) included new instruments that were not immersed in NaOCl or subjected to autoclave sterilization. Subgroup 2 were composed of instruments dynamically immersed for 3 minutes in 5.25% NaOCl solution. Subgroup 3 consisted of instruments that underwent 3 cycles of autoclave sterilization at 121◦C under 15 psi for 15 minutes. Subgroup 4 recruited instruments that received a cycle of both dynamic immersion in NaOCl solution for 3 minutes and 3 cycles of autoclave sterilization. All the files were rotated till fracture occurred. The means and standard deviations of the number of cycles to failure (NCF) were calculated and statistically analyzed using ANOVA with post-hoc Games Howell

ip indian journal of conservation and endodontics/ip indian journal of conservative and endodontics

An in-vitro comparative study of cyclic fatigue resistance of twisted files, Hyflex cm, Hyflex edm and Edgefile X3 after immersion in sodium hypochlorite and/or sterilization