Research Information System
European annals of dental sciences (Online), vol.49, no.1, pp.10-14, 2022 (Peer-Reviewed Journal)
Purpose: To compare the cyclic fatigue resistance of ProTaper Universal (PTU) and ProTaper Gold (PTG) nickel titanium őles at different angles and to examine the fractured surface areas by using scanning electron microscope (SEM). Materials & Methods: A special static test device made of stainless steel with artiőcial canals at 3 different angles. The őles were rotated until they were broken in artiőcial canals with 45°, 60° and 90° angles and also the time to fracture was recorded using a digital stopwatch. The number of cycles to failure was calculated for each instrument. Statistical analyzes were made by using one-way analysis of variance (Anova) for comparison between main groups. Results: PTG őles showed higher fatigue resistance (p<0.001) than PTU őles in all groups. SEM results displayed similar characteristic structures in pits and őssures caused by fracture due to cyclic fatigue regardless of angle and őle type. Conclusion: Although surface properties of broken instruments do not play a decisive role in clinical practice it was observed that heat-treated Ni-Ti őles exhibited higher fatigue resistance at all angles compared to conventional őles according to the number of cycles during experimental period.