Comparison of the cyclic fatigue resistance of four different file systems at body temperature

Purpose: Maintaining the original root canal configuration and minimalizing iatrogenic errors are crucial to mechanical instrumentation. Thus, this study aims to compare the cyclic fatigue resistance of newly developed EndoArt Blue and EndoArt Gold rotary files with ProTaper Gold and ProTaper Universal rotary files at body temperature.
Methods: The study included EndoArt Blue, EndoArt Gold, ProTaper Gold, and ProTaper Universal rotary file systems (n = 12/each group). Files were rotated in the artificial canals at a 60° angle and a 5-mm radius of curvature until fracture occurred. The time to fracture (Ttf) was recorded when a fracture was visually and/or audibly detected. The lengths of the fractured fragments (FL) were also measured. The Ttf and FL data were statistically analyzed using Kruskal–Wallis, One-way analysis of variance and the Bonferroni test at the 5% significance level, respectively.
Results: EndoArt Blue files had the statistically highest fatigue resistance, and ProTaper Universal files had the lowest (p< 0.001). There was also a statistically significant difference between EndoArt Gold and ProTaper Gold file systems (p = 0.001). There was no statistically significant difference in FL among the groups (p> 0.05).
Conclusion: EndoArt Blue file system had a significantly higher cyclic fatigue resistance than EndoArt Gold, ProTaper Gold, and ProTaper Universal file systems.