Resistência à fadiga cíclica dos instrumentos do sistema X1 e WaveOne

Abstract

Cyclic fatigue fracture occurs when an instrument is subjected to consecutive compression and tension loads at the same point, in the curvature region, with the metal undergoing tension in the outer portion and compression in the inner portion at the same time. This study aims to compare the cyclic fatigue resistance of instruments of the X1® Blue (Porto Alegre, RS, Brazil) and WaveOne® Gold (Dentsply Maillefer, Ballaigues, Suíça) system in artificial curved channels made of acrylic, through the cyclic fatigue resistance test. The study was characterized as being experimental and descriptive, using the method of quantitative approach. The research was carried out in the pre-clinical dentistry laboratory of the University Center Dom Bosco Higher Education Unit. To carry out the experiment, a total of 20 nickel-titanium files were used, being 10 instruments from WaveOne® Gold primary (20.07) (Dentsply Maillefer, Ballaigues, Suíça) and 10 instruments from the X1® system (20.06) (Porto Alegre, RS, Brazil). The results showed that the instruments of the WaveOne® system (Dentsply Maillefer, Ballaigues, Switzerland) presented better resistance to cyclic fatigue when compared to the instruments of the X1® system (Porto Alegre, RS, Brazil).