Effect of number of uses on the cyclic fatigue resistance of single-file rotary instruments

Authors : Burçin ARICAN, Ayfer ATAV ATEŞ

Pages : 176-180

Doi:10.32322/jhsm.862248

View : 12 | Download : 8

Publication Date : 2021-03-28

Article Type : Research Paper

Abstract :Aim: The purpose of this study was to evaluate and compare the cyclic fatigue resistance of two different single file nickel-titanium instruments -Reciproc blue insert ignore into journalissuearticles values(RB); and One Curve insert ignore into journalissuearticles values(OC);- used for single or in a certain number of times. Material and Methods: One Curve insert ignore into journalissuearticles values(n=40); and Reciproc Blue insert ignore into journalissuearticles values(n=40); files were used in this study. The instruments were divided into two subgroups insert ignore into journalissuearticles values(n=20);; those to be used for the first timeinsert ignore into journalissuearticles values(N); and those that were previously used insert ignore into journalissuearticles values(U); in the clinic for the root canal treatment of a vital mandibular molar with three root canals. Cyclic fatigue testing of these instruments was performed in an artificial stainless-steel canal with 60° curvature, 5 mm radius 1.5 mm width, and 3.0 mm depth. All the tested files were rotated/reciprocated under the continuous irrigation with distilled water at 37°C until fracture occurred. The time to failure insert ignore into journalissuearticles values(TTF); in seconds and the number of cycles to failure insert ignore into journalissuearticles values(NCF); were recorded. Data were statistically analyzed and the significance level was set at P RB-U > OC-N > OC-U. The TTF value of RB is greater than OC in both the new instrument groups and the used instrument groups. Conclusions: RB showed higher cyclic fatigue resistance than OC files in both new and used instrument groups. Reuse of RB and OC instruments significantly reduced the cyclic fatigue resistance of the instrument.
Keywords : cyclic fatigue, nickel titanium, Reciproc blue, One Curve, Single file