Eur Endod J. 2016; 1(1): 4 | DOI: 10.5152/eej.2016.16018

Bending resistance and cyclic fatigue life of a new single-file reciprocating instrument WaveOne Gold

Emmanuel João Nogueira Leal Silva¹, Justine Monnerat Tinoco¹, Eduardo Muniz Barretto Tinoco², Victor Talarico Leal Vieira², Luciana Moura Sassone³, Hélio Pereira Lopes^3
1Department of Endodontics, Grande Rio University (UNIGRANRIO) School of Dentistry, Rio de Janeiro, Brazil
²Department of Endodontics, Rio de Janeiro State University (UERJ) School of Dentistry, Rio de Janeiro, Brazil
³Department of Endodontics (H.P.L) Estácio de Sá University (UNESA) School of Dentistry, Rio de Janeiro, Brazil

Objective: The present study aimed to evaluate the bending resistance and cyclic fatigue fracture resistance of a new single-file reciprocating instrument called WaveOne Gold. Reciproc and WaveOne instruments were used as references for comparison.
Methods: Sixty 25-mm NiTi instruments (Reciproc R25, WaveOne Primary and WaveOne Gold Primary) were tested. Flexibility was determined by applying 45° bending tests using a universal testing machine (n=10). A custom-made device was used during cyclic fatigue test (n=10), comprising a stainless steel artificial ca- nal measuring 1.4 mm in diameter, 19 mm in total length with an 86° angle and 6 mm radius of curvature. Possible deformations at the helical shaft and mode of fracture were evaluated using scanning electron mi- croscopy analysis. Statistical analysis was performed using one-way analysis of variance. Post hoc pair-wise comparisons were performed using Tukey’s test for multiple comparisons (P<0.05).
Results: WaveOne presented significantly higher bending resistance than the other tested systems (P<0.05), whereas Reciproc presented the lowest bending resistance (P<0.05). Reciproc revealed a significantly longer cyclic fatigue fracture resistance than the other systems (P<0.05).
Conclusions: Although WaveOne Gold presented higher flexibility than WaveOne, no differences in the resis- tance to fatigue were observed between both systems. The Reciproc files were more flexible and resistant to fatigue for the angle of curvature of 86° and 6 mm radius than WaveOne and WaveOne Gold files.

Keywords: Bending resistance, cyclic fatigue, instrumentation and rotary, reciprocating movement, NiTi alloy; WaveOne Gold

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