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Cyclic Fatigue and Physical Properties Testing of Different Small Taper Heat-Treated Reciprocating Files
Ahmad Altuwalah1, Taher Al Omari2, Riyadh Alroomy3
1Department of Restorative and Prosthodontic Dental Sciences, College of Dentistry, Majmaah University, Almajmaah, Saudi Arabia.
Introduction:
This study aimed to evaluate the cyclic fatigue resistance of small-size reciprocating files at simulated intracanal temperature and analyze their chemical and physical properties.
Methods:
Sixty new endodontic files were subjected to cyclic fatigue resistance testing, which was performed in a CNC-milled stainless-steel artificial canal (60° curvature, 5 mm radius, 19 mm length; 1.4 mm inner diameter) submerged in a 32.0 °C water bath. Two samples were analyzed using differential scanning calorimetry and Energy Dispersive X-ray Fluorescence, while two fractured samples underwent scanning electron microscopy.
Results:
R Motion (RM) (2542 s) and Tia Premium Blue (TPB) (2419 s) exhibited significantly higher resistance to cyclic fatigue compared to Tia Viera Gold (283 s), W Plus Gold (318 s), and Wave One Gold (292 s). RM, Tia Viera Gold, and W Plus Gold had significantly longer fractured segments than TPB and Wave One Gold.
Conclusions:
Blue heat-treated files showed significantly higher cyclic fatigue resistance compared to gold-treated counterparts, with RM and TPB lasting over 2400 seconds, while others failed within 300 seconds.
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