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CC BY 4.0 · Eur J Dent
DOI: 10.1055/s-0045-1806949
Original Article

Multimethod Analysis of a Novel NiTi Rotary System: Cyclic Fatigue, Buckling Resistance, and Bending Tests

Alyne Rouse Rocha
1   Departamento de Endodontia, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, São Paulo, Brazil
,
Ana Grasiela Limoeiro
2   Department of Dentistry, Endodontics and Dental Materials, Bauru Dental School, University of São Paulo, Bauru, Brazil
,
Iris Nogueira Seckler
1   Departamento de Endodontia, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, São Paulo, Brazil
,
Bárbara Rebeca Alves 
1   Departamento de Endodontia, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, São Paulo, Brazil
,
Adriana Jesus Soares
3   Department of Endodontics, Piracicaba School of Dentistry, State University of Campinas, Piracicaba, Brazil
,
Samuel Nogueira Lima
4   Department of Endodontics, Mário Juca University Center, Maceió, Alagoas, Brazil
,
Victor Talarico Vieira
5   Department of Endodontics, Grande Rio University (UnigranRio), Rio de Janeiro, Brazil
,
Marília Fagury Videira Marceliano-Alves 
6   Department of Endodontics, Post- Graduate Program in Dentistry, Nova Iguaçu, Brazil
7   Department of Endodontics, Maurício de Nassau University Centre (UNINASSAU), Rio de Janeiro, Brazil
8   Department of Dental Research Cell, Dr. D. Y. Patil Vidyapeeth, Pune, India
,
Wayne Martins Nascimento
1   Departamento de Endodontia, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, São Paulo, Brazil
,
Luis Cardoso Rasquin
9   Department of Endodontics, Federal University of Bahia, Brazil
,
Marcos Frozoni
1   Departamento de Endodontia, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, São Paulo, Brazil
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Abstract

Objective

Instruments are susceptible to deformation and/or fracture, which may represent a failure in endodontic treatment. This study assessed the mechanical properties of nickel-titanium rotary instruments through cyclic fatigue, buckling resistance, and 45° bending tests.

Material and Methods

One hundred and twenty rotary instruments were divided into three groups: Super Flexi Files Blue (SFB; 20/.04), TruNatomy Small (TN; 20/.04), and ProTaper Ultimate Shaper (PTU; 20/.04). They underwent cyclic fatigue tests at fixed and manufacturer-specified speeds, along with buckling and bending tests. SFB files exhibited the greatest cyclic fatigue resistance with the longest time to fracture and highest number of cycles to failure (NCF), followed by TN and PTU. For PTU and TN, reducing rotation speed increased time to fracture and NCF, while SFB showed reduced values with speed increase.

Results

TN exhibited the highest buckling resistance, whereas PTU had superior performance in the bending test. Rotation speed significantly affected cyclic fatigue resistance, with SFB being the most resistant overall. TN demonstrated notable buckling resistance and flexibility.

Conclusion

The rotational speed significantly affects the resistance of instruments to cyclic fatigue and that the SFB file is the most resistant file to cyclic fatigue. The TN file proved to be the most resistant and flexible.

Keywords

endodontic - bending strength - fracture - resistance

Authors' Contribution

Conceptualization: A.R., I.N.S., and M.F.; data curation: W.M.N., B.R.A., and A.G.L.; formal analysis: S.N.L., W.M.N., and A.G.L.; investigation: V.T.V., A.R., and M.F.; methodology: A.R., M.F., A.G.L., and W.M.N.; project administration: V.T.V., A.G.L., and W.M.N.; supervision: A.J.S., A.G.L. and W.M.N.; validation: all authors; visualization: all authors; writing—original draft: all authors; writing—review and editing: A.G.L. and M.F.




Publication History

Article published online:
23 April 2025

© 2025. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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