Influence of file motion on cyclic fatigue of new nickel titanium instruments

Giansiracusa, Alessio and Sannino, Gianpaolo and Pongione, Giancarlo and Testarelli, Luca and Al-Sudani, Dina and Jantarat, Jeeraphat and De Luca, Massimo and Gambarini, Gianluca (2013) Influence of file motion on cyclic fatigue of new nickel titanium instruments. Annali di stomatologia, 4 (1). pp. 149-151. ISSN 1971-1441

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Abstract

Aim.The aim of the present study was to compare the resistance to cyclic fatigue of Hyflex® (Coltene-Whaledent, Allstatten, Switzerland) size 40 taper.04 nickel titanium instruments used in continuous rotation versus the use with a reciprocating motion. The null hypothesis was that different file motions had no influence on the lifetime of instruments subjected to a cyclic fatigue test. Methodology.24 Hyflex® size 40 taper.04 nickel titanium instruments were randomly divided in two groups (n=12each), and submitted to a cyclic fatigue test. The firstgroup (CR group) were used with a continuous rotation,while the second one (RCP group) with a reciprocating motion. The cyclic fatigue tests were performed by using a stainless steel block containing an artificial canal shaped with a 135° angle. All instruments were rotated or reciprocated until fracture occurred. The time to fracture was recorded visually with a 1/100 second chronometer. Data were recorded and statistically analysed. Results. Results indicated that instruments used with are ciprocating motion showed a significant increase in the meantime to failure when compared to those used in continuous rotation. Conclusions. The null hypothesis was rejected. Results ofthe present study showed that reciprocating motion extended resistance to cyclic fatigue of the tested nickel titanium instruments, when compared to continuous rotation.

Item Type:	Article
Uncontrolled Keywords:	Cyclic fatigue, nickel titanium, instruments
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 14:57
Last Modified:	16 May 2013 11:04
URI:	http://eprints.bice.rm.cnr.it/id/eprint/5078

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