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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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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).


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).


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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  1. Peters OA (2004) Current challenges and concepts in the preparation of root canal systems: a review. J Endod 30:559–567

    Article  PubMed  Google Scholar 

  2. Ebihara A, Yahata Y, Miyara K, Nakano K, Hayashi Y, Suda H (2011) Heat treatment of nickel–titanium rotary endodontic instruments: effects on bending properties and shaping abilities. Int Endod J 44:843–849

    Article  PubMed  Google Scholar 

  3. Anderson ME, Price JW, Parashos P (2007) Fracture resistance of electropolished rotary nickel-titanium endodontic instruments. J Endod 33:1212–1216

    Article  PubMed  Google Scholar 

  4. He R, Ni J (2010) Design improvement and failure reduction of endodontic files through finite element analysis: application to V-taper file designs. J Endod 36:1552–1557

    Article  PubMed  Google Scholar 

  5. Govindjee RG, Govindjee S. Thermal phase transformations in commercial dental files. In: Structural Engineering Mechanics and Materials. Report No. UCB/SEMM- 2015/02. Accessed 04 July 2016.

  6. Bergmans L, Van Cleynenbreugel J, Beullens M, Wevers M, Van Meerbeek B, Lambrechts P (2003) Progressive versus constant tapered shaft design using NiTi rotary instruments. Int Endod J 36:288–295

    Article  PubMed  Google Scholar 

  7. Shen Y, Riyahi AM, Campbell L, Zhou H, Du T, Wang Z, Qian W, Haapasalo M (2015) Effect of a combination of torsional and cyclic fatigue preloading on the fracture behavior of K3 and K3XF instruments. J Endod 41:526–530

    Article  PubMed  Google Scholar 

  8. Plotino G, Costanzo A, Grande NM, Petrovic R, Testarelli L, Gambarini G (2012) Experimental evaluation on the influence of autoclave sterilization on the cyclic fatigue of new nickel-titanium rotary instruments. J Endod 38:222–225

    Article  PubMed  Google Scholar 

  9. Gambarini G, Gergi R, Grande NM, Osta N, Plotino G, Testarelli L (2013) Cyclic fatigue resistance of newly manufactured rotary nickel titanium instruments used in different rotational directions. Aust Endod J 39:151–154

    Article  PubMed  Google Scholar 

  10. Ha JH, Kim SK, Cohenca N, Kim HC (2013) Effect of R-phase heat treatment on torsional resistance and cyclic fatigue fracture. J Endod 39:389–393

    Article  PubMed  Google Scholar 

  11. Shen Y, Zhou H, Campbell L, Wang Z, Wang R, Du T, Haapasalo M (2014) Fatigue and nanomechanical properties of K3XF nickel-titanium instruments. Int Endod J 47:1160–1167

    Article  PubMed  Google Scholar 

  12. Pérez-Higueras JJ, Arias A, de la Macorra JC (2013) Cyclic fatigue resistance of K3, K3XF, and twisted file nickel-titanium files under continuous rotation or reciprocating motion. J Endod 39:1585–1588

    Article  PubMed  Google Scholar 

  13. Gambarini G, Rubini AG, Al Sudani D, Gergi R, Culla A, De Angelis F, Di Carlo S, Pompa G, Osta N, Testarelli L (2012) Influence of different angles of reciprocation on the cyclic fatigue of nickel-titanium endodontic instruments. J Endod 38:1408–1411

    Article  PubMed  Google Scholar 

  14. Karataş E, Arslan H, Büker M, Seçkin F, Çapar ID (2015) Effect of movement kinematics on the cyclic fatigue resistance of nickel-titanium instruments. Int Endod J. doi:10.1111/iej.12453

    Google Scholar 

  15. Larsen CM, Watanabe I, Glickman GN, He J (2009) Cyclic fatigue analysis of a new generation of nickel titanium rotary instruments. J Endod 35:401–403

    Article  PubMed  Google Scholar 

  16. Grande NM, Plotino G, Pecci R, Bedini R, Malagnino VA, Somma F (2006) Cyclic fatigue resistance and three-dimensional analysis of instruments from two nickel-titanium rotary systems. Int Endod J 39:755–763

    Article  PubMed  Google Scholar 

  17. Sattapan B, Nervo GJ, Palamara JE, Messer HH (2000) Defects in rotary nickel-titanium files after clinical use. J Endod 26:161–165

    Article  PubMed  Google Scholar 

  18. Peters OA, Barbakow F (2002) Dynamic torque and apical forces of ProFile.04 rotary instruments during preparation of curved canals. Int Endod J 35:379–389

    Article  PubMed  Google Scholar 

  19. Plotino G, Grande NM, Cordaro M, Testarelli L, Gambarini G (2009) A review of cyclic fatigue testing of nickel-titanium rotary instruments. J Endod 35:1469–1476

    Article  PubMed  Google Scholar 

  20. Pruett JP, Clement DJ, Carnes DL Jr (1997) Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 23:77–85

    Article  PubMed  Google Scholar 

  21. Cheung GS, Shen Y, Darvell BW (2007) Effect of environment on low-cycle fatigue of a nickel-titanium instrument. J Endod 33:1433–1437

    Article  PubMed  Google Scholar 

  22. Zinelis S, Darabara M, Takase T, Ogane K, Papadimitriou GD (2007) The effect of thermal treatment on the resistance of nickel-titanium rotary files. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 103:843–847

    Article  PubMed  Google Scholar 

  23. Çapar ID, Kaval ME, Ertas H, Sen BH (2015) Comparison of the cyclic fatigue resistance of five different rotary path-finding instruments made of conventional nickel-titanium wire, M-wire and controlled memory wire. J Endod 41:535–5382015

    Article  PubMed  Google Scholar 

  24. Bortoluzzi EA, Carlon D Jr, Meghil MM, El-Awady AR, Niu L, Bergeron BE, Susin L, Cutler CW, Pashley DH, Tay FR (2015) Efficacy of 3D conforming nickel titanium rotary instruments in eliminating canal wall bacteria from oval-shaped root canals. J Dent 43:597–604

    Article  PubMed  Google Scholar 

  25. Peters OA, Arias A, Paqué F (2015) A micro-computed tomographic assessment of root canal preparation with a novel instrument, TRUShape, in mesial roots of mandibular molars. J Endod 41:1545–1550

    Article  PubMed  Google Scholar 

  26. Plotino G, Grande NM, Testarelli L, Gambarini G (2012) Cyclic fatigue of Reciproc and WaveOne reciprocating instruments. Int Endod J 45:614–618

    Article  PubMed  Google Scholar 

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Correspondence to Mehmet Emin Kaval.

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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.


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).

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