E-ISSN 2548-0839
European Endodontic Journal Cyclic Fatigue and Torsional Resistance of Four Martensite-Based Nickel Titanium Reciprocating Instruments []
. 2020; 5(3): 231-235 | DOI: 10.14744/eej.2020.16878

Cyclic Fatigue and Torsional Resistance of Four Martensite-Based Nickel Titanium Reciprocating Instruments

Emmanuel Silva1, Carolina Oliveira de Lima2, Victor Vieira1, Henrique Antunes1, Edson Jorge Lima Moreira1, Marco Versiani3
1Department of Endodontics, Faculty of Dentistry, Grande Rio University UNIGRANRIO, Rio de Janeiro, Brazil
2Department of Endodontics, Faculty of Dentistry, State University of Rio de Janeiro UERJ, Brazil
3Department of Endodontics, Faculty of Dentistry, Fluminense Federal University

Objective: To evaluate cyclic fatigue and torsional resistance of Reciproc Blue R25 (VDW, Munich, Germany), WaveOne Gold Primary (Dentsply Maillefer, Ballaigues, Switzerland), ProDesign R (Easy Equipamentos Odontológicos, Belo Horizonte, Brazil), and X1 Blue File (MK Life, Porto Alegre, Brazil) nickel titanium (NiTi) martensite reciprocating instruments.
Methods: In each group, ten instruments were tested for cyclic fatigue resistance using a stainless-steel artificial canal (curvature angle of 80° and radius of 3 mm) and ten instruments for torsional failure according to ISO 3630-1 standard. The surface of the fractured instruments was examined under scanning electron microscopy (SEM) at ×250 magnification. The results were compared statistically with one-way ANOVA and post hoc Tukey tests and the alpha-type error was set at 5%.
Results: X1 blue file and ProDesign Rinstruments showed highest time to fracture than Reciproc Blue and Wave One Gold (P<0.05). However, no differences were found between X1 Blue File and ProDesign R (P>0.05). In addition, Reciproc Blue demonstrated highest time to fracture than WaveOne Gold (P<0.05). The lowest torsional resistance (1.0±0.2 N.cm) and angle of rotation (412º±46) was observed in the ProDesign R group (P<0.05). SEM analyses of fractured surfaces showed a crack initiation area and overload fast fracture zone after cyclic fatigue test, and concentric abrasion marks with microvoids at the centre of rotation after torsional failure experiment.
Conclusion: Overall, X1 Blue File and ProDesign R showed higher cyclic fatigue resistance than Reciproc Blue and WaveOne Gold instruments, while ProDesign R had the lowest torsional resistance and angular rotation values to fracture. SEM analysis of all instruments demonstrated typical failures features in both cyclic fatigue and torsional failure tests. (EEJ-2019-12-130)

Keywords: Cyclic fatigue, dental instruments, torsional force

Emmanuel Silva, Carolina Oliveira de Lima, Victor Vieira, Henrique Antunes, Edson Jorge Lima Moreira, Marco Versiani. Cyclic Fatigue and Torsional Resistance of Four Martensite-Based Nickel Titanium Reciprocating Instruments. . 2020; 5(3): 231-235

Corresponding Author: Emmanuel Silva
LookUs & Online Makale