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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


Summer 2013
Volume 7 , Issue 2

Pages: 101-104
Share Abstract:

Dynamic or static cyclic fatigue tests: which best determines the lifespan of endodontic files?

Gambarra-Soares, Thaiane / Lopes, Hélio Pereira / Oliveira, Julio Cezar Machado / Souza, Letícia Chaves / Vieira, Victor Talarico Leal / Elias, Carlos Nelson

Aim: The objective of this study was to evaluate which method, static or dynamic cyclic fatigue test, is the best to determine the number of cycles necessary to fracture rotary nickel-titanium endodontic instruments.
Materials and methods: The static cyclic fatigue experiment used 10 instruments (Mtwo; VDW, Munich, Germany) that were statically freely rotated at 310 rpm in a metallic canal until fracturing. For the dynamic test, another set of 10 instruments was freely rotated at the same speed and in the same canal, but with a back and forth movement until they reached the fracture point.
Results: The data were analysed by Student t test with a significance level set at 5% (P < 0.05). The dynamic test increased the lifespan of the instruments by 254%.
Conclusions: Despite the fact that the static test complies with the no. 28 ANSI/ADA specifications, the dynamic cyclic fatigue test provides more reliable data regarding the lifespan determination of endodontic files and better represents the clinical practice. The present study presented a reliable way to standardise the test without human interference during the test.

Keywords: apparatus and instruments, cyclic fatigue, dental instruments, endodontics, nickeltitanium alloy

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