Abstract
Aim: New nickel-titanium file systems with improved fatigue resistance are being introduced to the market. This study aimed to compare the cyclic fatigue resistance (CFR) of G1 (#12) file of G file system (Micro Mega, Besancon, France), ProGlider (Dentsply Maillefer, Ballaigues, Switzerland) single-file rotary pathfinding system, and the #13 file of the Flex Glide system (Neoendo, Gurugram, India). Materials and Methods: Each group had a sample size of 10 files. The cyclic fatigue test was conducted in an artificial stainless steel canal in a customized device. The artificial canal contained an inner diameter of 1.5 mm with 60 degrees angle of curvature and 5 mm radius of curvature. The file tip was positioned at 18 mm with a stopper and then rotation began, synchronized with timing by a digital stopwatch (Timex, Middlebury, CT) to the thousandth of a second. The center of the curvature was located at 7 mm from the tip of the device. For each instrument, time to fracture and the number cycles to fracture (NCF) were recorded. The data were analyzed statistically. Results: ProGlider files had a significantly higher resistance to cyclic fatigue than G1 files, which in turn had significantly higher CFR than Flex Glide instruments (P < 0.05). The lengths of the fractured segment of ProGlider files and G1 files were significantly higher than the Flex Glide files. Conclusion: Thus, it can be inferred that the ProGlider files had the highest resistance to cyclic fatigue and can be advocated for glide path preparations in severely curved canals.