Cyclic fatigue resistance of four nickel-titanium rotary instruments: a comparative study

Pedullà, Eugenio and Plotino, Gianluca and Grande, Nicola Marino and Pappalardo, Alfio and Rapisarda, Ernesto (2012) Cyclic fatigue resistance of four nickel-titanium rotary instruments: a comparative study. Annali di stomatologia, 3 (2). pp. 59-63. ISSN 1971-1441

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Abstract

Aims. The aim of this study is to investigate cyclic fatigue resistance of four nickel – titanium rotary (NTR) instruments produced by a new method or traditional grinding processes. Methods. Four NTR instruments from different brands were selected: group 1. Twisted File produced by a new thermal treatment of nickel – titanium alloy; group 2. Revo S SU; group 3. Mtwo and group 4. BioRaCe BR3 produced by traditional grinding processes. A total of 80 instruments (20 for each group) were tested for cyclic fatigue resistance inside a curved artificial canal with a 60 degree angle of curvature and 5 mm radius of curvature. Time to fracture (TtF) from the start of the test until the moment of file breakage and the length of the fractured tip was recorded for each instrument. Means and standard deviations (SD) of TtF and fragment length were calculated. Data were subjected to one-way analysis of variance (ANOVA). Results. Group 1 (Twisted File) showed the highest value of TtF means. Cyclic fatigue resistance of Twisted File and Mtwo was significantly higher than group 2 (Revo S SU) and 4 (BioRace BR3), while no significant differences were found between group 1 (Twisted File) and 3 (Mtwo) or group 2 (Revo S SU) and 4 (BioRaCe BR3). Conclusions. The cyclic fatigue resistance of Twisted File was significantly frigher than instruments produced with traditional grinding process except of Mtwo files.

Item Type:	Article
Uncontrolled Keywords:	Cyclic fatigue, grinding process, nickeltitanium, rotary instruments, twisted file
Subjects:	600 Tecnologia - Scienze applicate > 610 Medicina e salute (Classificare qui la tecnologia dei servizi medici) > 617 Rami vari della medicina; Chirurgia > 617.5 Medicina regionale; Chirurgia regionale
Depositing User:	Chiara D'Arpa
Date Deposited:	17 Apr 2013 13:11
Last Modified:	16 May 2013 10:57
URI:	http://eprints.bice.rm.cnr.it/id/eprint/5002

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