Effect of NaOCl solution on the cyclic fatigue resistance of traditional and heat-treated file systems

Abstract

Aim: To compare the cyclic fatigue resistance at distilled water and %5.25 NaOCl of immersed ProTaper Gold (Dentsply Sirona,Ballaigues, Switzerland) and ProTaper Universal (Dentsply Sirona, Ballaigues, Switzerland) file systems.Material and Methods: The ProTaper Gold F2 (25.06v taper) and ProTaper Universal F2 (25.06v taper) file systems were immersedin distilled water andNaOCl for 5 minutes. After immersion process files were rotated at artificial canal with 60O curvature and a5-mm radius until fracture occurred. Time to fracture and fractured lengths were recorded. Data were analyzed statistically usingindependent t-tests. Statistical significance was set at P <.05.Results: ProTaper Gold files had a significantly higher resistance to cyclic fatigue than ProTaper Universal files (P < .05). WhenProTaper Universal immersed in distilled water showed higher resistance to cyclic fatigue than immersed in NaOCl solution (P <.05).Conclusion: ProTaper Gold system more resistant than ProTaper Universal system to cyclic failure. The effect of NaOCl were higheron the ProTaper Universal system.