Effect of Different Temperatures on Flexural Cyclic Fatigue Resistance of 2Shape and OneShape Rotary Endodontic Instruments

Effect of autoclave sterilisation and heat activated sodium hypochlorite irrigation on the performance of nickel-titanium rotary files against cyclic fatigue

“…According to the result of the present study, heating the NaOCl to 60ºC caused a more dramatic reduction in the CFR. The adverse effect of the thermal activation came in accordance with Bedier et al [49] as they demonstrated that high temperature of the irrigation solution (distilled water) had a reducing effect on the flexural CFR of the one (predecessor of OC) and two shape system of rotary endodontic instruments. The studies conducted by Demiral et al [50], and Keles et al [17] also supported the current results as the CFR of one-shape file system exposed to heat-activated NaOCl at 50ºC showed a significant reduction.…”

Factors influencing NiTi endodontic file separation: A thematic review

“…36,37 The number of cracks generated on the surface where the stress concentration is higher than the cohesion forces during flexion causes crack propagation. [38][39][40][41] The files are subjected to torsional and fatigue forces during endodontic procedures. From the fatigue contribution to failure, Braz Fernandes et al 8 found that independent of the geometry, sections near the midpoint of the curved section of the file inserted in the root canal were subjected to higher stress levels during instrumentation due to the occurrence of maximum deformation amplitude.…”