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      Bending resistance and cyclic fatigue life of Reciproc Blue, WaveOne Gold, and Genius files in a double (S-shaped) curved canal

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          Abstract

          Background. This study compared the cyclic fatigue resistance, bending resistance and cross-sectional areas of Reciproc Blue (RPC Blue), WaveOne Gold (WOG), and Genius File (GF) NiTi rotary systems.

          Methods. Forty RPC Blue R25 (25/.08), 40 WOG Primary (25/.07) and 40 GF (25/.04) files were used in the present study. Flexibility of the files was determined by 45° bending test. The instruments were also subjected to cyclic fatigue resistance, calculating the number of cycles to fracture (NCF) in an S-shaped artificial stainless steel canal. Also the cross-sectional areas of the files were measured at D5 level. The length of the fractured file tips was measured. The fracture surface of all the fragments was examined with a scanning electron microscope. Data was statistically analyzed using one-way ANOVA and post hoc Tukey tests.

          Results. In both the apical and coronal curvatures, the NCF of the GF was significantly higher than that of the RPC Blue and WOG files. There was no significant difference between the GF, WOG and Reciproc Blue files with respect to the lengths of the fractured file fragments in either the apical or coronal curvature. The bending resistance of the GF was signif-icantly higher than that of the RPC Blue and WOG files. The RPC Blue had the largest cross-sectional area, and the GF had the smallest cross-sectional area.

          Conclusion. Within the limitations of the present study, the GF NiTi system exhibited the highest cyclic and bending re-sistance among the experimental groups.

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          Most cited references18

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          Cyclic fatigue resistance and three-dimensional analysis of instruments from two nickel-titanium rotary systems.

          To determine how instrument design affects the fatigue life of two nickel-titanium (Ni-Ti) rotary systems (Mtwo and ProTaper) under cyclic fatigue stress in simulated root canals. Cyclic fatigue testing of instruments was performed in stainless steel artificial canals with radii of curvature of 2 or 5 mm and an angle of curvature of 60 degrees . A total of 260 instruments were rotated until fracture occurred and the number of cycles to failure were recorded. The morphology of Ni-Ti rotary instruments was investigated by measuring the volume of millimetre slices of each instrument size starting from the tip to the shank by means of microCT analysis. The fracture surface of three representative samples of each size was analysed by scanning electron microscopy (SEM). Data were analysed by one-way anova, Holm t-test, paired t-test and linear regression; the significance was determined at the 95% confidence level. Cycles to failure significantly decreased as the instrument volume increased for both the radii of curvature tested (P < 0.01). The radius of curvature had a statistically significant influence on the fatigue life of the instruments (P < 0.05). Larger instruments underwent fracture in less time under cyclic stress than smaller ones. SEM evaluation showed typical features of fracture through fatigue failure. The metal volume in the point of maximum stress during a cyclic fatigue test could affect the fatigue life of Ni-Ti rotary instruments. The larger the metal volume, the lower the fatigue resistance.
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            Instrument fracture: mechanisms, removal of fragments, and clinical outcomes

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              Comparison of the Cyclic Fatigue Resistance of 5 Different Rotary Pathfinding Instruments Made of Conventional Nickel-Titanium Wire, M-wire, and Controlled Memory Wire

              This study compared the cyclic fatigue resistance of current nickel-titanium rotary path-finding instruments.
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                Author and article information

                Journal
                J Dent Res Dent Clin Dent Prospects
                J Dent Res Dent Clin Dent Prospects
                J Dent Res Dent Clin Dent Prospects
                JODDD
                TBZMED
                Journal of Dental Research, Dental Clinics, Dental Prospects
                Tabriz University of Medical Sciences
                2008-210X
                2008-2118
                Autumn 2017
                13 December 2017
                : 11
                : 4
                : 241-246
                Affiliations
                1Department of Endodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey
                2Department of Endodontics, Faculty of Dentistry, Medipol University, Samsun, Turkey
                3Samsun Oral and Dental Health Hospital, Samsun, Turkey
                Author notes
                [* ] Corresponding Author; tahaozyurek@ 123456hotmail.com
                Article
                10.15171/joddd.2017.042
                5768957
                29354251
                7cffecda-b236-43b7-8b24-21b2298a490d
                © 2017 Özyürek et al.

                This is an Open Access article published and distributed by Tabriz University of Medical Sciences under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 30 June 2017
                : 29 September 2017
                Page count
                Figures: 2, Tables: 2, References: 30
                Categories
                Original Article

                Dentistry
                cyclic fatigue,cross-section area,double curvature,genius file,reciproc blue,waveone gold
                Dentistry
                cyclic fatigue, cross-section area, double curvature, genius file, reciproc blue, waveone gold

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