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ENDO - Endodontic Practice Today

Edited by Bun San Chong and Edgar Schäfer

Official Publication of the Belgian Association for Endodontology and Traumatology (BAET) and the French Society of Endodontics (SFE)

ISSN (print) 1753-2809 • ISSN (online) 1753-2817


Spring 2012
Volume 6 , Issue 1

Pages: 41 - 44
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Mechanical properties of endodontic instruments made with different nickel titanium alloys: a stiffness test

Pongione, Giancarlo / Giansiracusa, Alessio / Lisotti, Fabrizio / Milana, Valerio / Testarelli, Luca

Aim: A new manufacturing method aimed at producing more flexible and resistant nickel titanium (NiTi) root canal instruments has been recently developed (CM-wire). The purpose of the study was to determine whether this new manufacturing method produces NiTi instruments (Hyflex) of superior flexibility, when compared with instruments produced by a traditional or thermally treated NiTi alloy. Materials and methods: Ten 0.06 size 25 Hyflex instruments (Coltčne Whaledent, Langenau, Germany), ten 06.25 Vortex instruments (Dentsply-Tulsa, Tulsa, OK, USA) and ten 06.25 RaCe instruments (FKG, La Chaux-de-Fonds, Switzerland) were evaluated for stiffness on bending. Test procedures strictly followed recommendations from ISO specification 3630-1. Bending moments were measured when the instruments attained a 45-degree bend. All data obtained were recorded and statistically analysed using an ANOVA test, followed by a post-hoc Tukey (HSD) test. The level of significance was set at α = 0.05. Results: Statistical analysis showed that bending moments were significantly greater (P < 0.05) for Vortex (mean value 57.58 g/cm) and RaCe (mean value 52.11 g/cm) instruments, compared to the Hyflex instruments (mean value 14.46 g/cm), thereby confirming the increased flexibility of the instruments produced with CM-wire alloy. Conclusion: Results of the present study demonstrate the ability of the new CM-wire manufacturing process to produce more flexible NiTi rotary instruments. Keywords: endodontic rotary instruments, mechanical properties, nickel titanium

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