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Comparative evaluation of cyclic fatigue resistance of four different nickel-titanium rotary files with different cross-sectional designs and alloy properties

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Abstract

Objective

The purpose of the present study was to evaluate the cyclic fatigue resistance of F6 SkyTaper (Komet Brasseler, Lemgo, Germany), K3XF (SybronEndo, Orange, CA, USA), new generation OneShape (Micro Mega, Besancon, France) and TRUShape 3D conforming files (Dentsply Tulsa Dental Specialties, Tulsa, OK, USA).

Material and methods

Ten instruments from each group were selected and allowed to rotate using a low-torque motor in a stainless steel block with 1.5 mm diameter, 3 mm radius of 60° angle of curvature at the manufacturer’s recommended speed, and the number of cycles (NCF) from the beginning to the fracture was recorded. The data were analyzed using one-way ANOVA followed by post-hoc Tukey’s test (P = 0.05).

Results

The ranking of the groups from the highest to the lowest NCF was as follows: F6 SkyTaper (959 ± 92), K3XF (725 ± 71), TRUShape (575 ± 84) and OneShape (289 ± 58). Statistically significant differences were detected between all groups (P < 0.05).

Conclusion

Within the limitations of this study, F6 SkyTaper instruments presented the highest cyclic fatigue resistance among the tested instruments. The S-shaped cross-sectional design of F6 SkyTaper instruments could be the most important factor on the superior cyclic life span of these instruments.

Clinical relevance

In endodontic practice, preferring the instruments with higher cyclic fatigue resistance would help to minimize the risk of instrument fractures; therefore especially during the preparation of curved canals, instruments with smaller core area and less cross-sectional metal mass, which could lead higher flexibility, can be proposed.

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Correspondence to Mehmet Emin Kaval.

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Conflict of interest

Mehmet Emin Kaval declares that he has no conflict of interest. Ismail Davut Capar declares that he has no conflict of interest. Huseyın Ertas declares that he has no conflict of interest. Bilge Hakan Sen declares that he has no conflict of interest.

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This study was not supported by any foundation.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Kaval, M.E., Capar, I.D., Ertas, H. et al. Comparative evaluation of cyclic fatigue resistance of four different nickel-titanium rotary files with different cross-sectional designs and alloy properties. Clin Oral Invest 21, 1527–1530 (2017). https://doi.org/10.1007/s00784-016-1917-x

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  • DOI: https://doi.org/10.1007/s00784-016-1917-x

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