Influence of surrounding temperature and angle of file access on cyclic fatigue resistance of two single file nickel‐titanium instruments. (4th December 2020)

• Record Type: Journal Article
• Authors: La Rosa, Giusy Rita Maria; Palermo, Carlotta; Ferlito, Sebastiano; Isola, Gaetano; Indelicato, Francesco; Pedullà, Eugenio
• Is Part Of: Australian endodontic journal. Volume 47:Number 2(2021)
• Page Start: 260
• Page End: 264
• Publication Date: 2020-12-04
• Subjects: angle of file access -- cyclic fatigue -- F6 SkyTaper -- One Curve -- temperature; Endodontics -- Periodicals; Endodontics -- Periodicals; 617.6342
• DOI: 10.1111/aej.12473
• Languages: English
• ISSNs: 1329-1947

Abstract

Abstract: The purpose of this study was to evaluate the influence of surrounding temperature and angle of file access on cyclic fatigue resistance of F6 SkyTaper (F6ST) and One Curve (OC). 120 new files #25.06 were tested at two insertion angles (0° and 20°) at room (20°C ± 1°C) and body (35°C ± 1°C) temperatures in a 16‐mm stainless steel artificial canal (60° curvature and 5‐mm radius), using a customised device. Cyclic fatigue resistance was expressed as time to fracture (TtF) in seconds. Data were analysed statistically ( P < 0.05). All instruments exhibited lower TtF at 35°C ( P < 0.05). An access of 20° did not significantly influence the TtF of tested instruments, independently from the temperature. OC exhibited higher TtF of F6ST at 20°C with a 20° inclination ( P < 0.05). Under the present conditions, F6ST and OC showed a significant reduction of cyclic fatigue resistance at body temperature. A file inclined insertion did not affect the cyclic fatigue resistance of tested instruments at both temperatures.