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Year : 2020  |  Volume : 12  |  Issue : 2  |  Page : 158-162

Comparison of cyclic fatigue resistance of three NiTi glide path files with different cross-sectional geometric characteristics: An in vitro experimental study

Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Ministry of National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia

Correspondence Address:
Dr. Abdulmohsen Alfadley
Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, Ministry of National Guard Health Affairs, P.O. Box: 22490, Riyadh 11426.
Kingdom of Saudi Arabia
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jioh.jioh_191_19

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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, Besançon, 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° 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.

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