E-ISSN 2548-0839
Bending resistance and cyclic fatigue life of a new single-file reciprocating instrument WaveOne Gold []
. 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 Joo Nogueira Leal Silva1, Justine Monnerat Tinoco1, Eduardo Muniz Barretto Tinoco2, Victor Talarico Leal Vieira2, Luciana Moura Sassone3, Hlio Pereira Lopes3
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) Estcio de S 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 Tukeys 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, reciprocating movement; NiTi alloy; WaveOne Gold

Emmanuel Joo Nogueira Leal Silva, Justine Monnerat Tinoco, Eduardo Muniz Barretto Tinoco, Victor Talarico Leal Vieira, Luciana Moura Sassone, Hlio Pereira Lopes. Bending resistance and cyclic fatigue life of a new single-file reciprocating instrument WaveOne Gold. . 2016; 1(1): 4

Corresponding Author: Emmanuel Joo Nogueira Leal Silva, Brazil

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