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CC BY 4.0 · Eur J Dent 2023; 17(02): 472-477
DOI: 10.1055/s-0042-1747952
Original Article

Influence of Heat Treatment of Nickel–Titanium Instruments on Cyclic Fatigue Resistance in Simulated Curved Canals

Gustavo Oliveira Campos
1   Department of Endodontics, School of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
,
Carlos Eduardo Fontana
2   Department of Center for Healthy Sciences, Postgraduate Program in Health Sciences, Pontifícia Universidade Católica, Campinas, São Paulo, Brazil
,
Victor Talarico Leal Vieira
3   Department of Odontology, Grande Rio University, Duque de Caxias, Rio de Janeiro, Brasil
,
Carlos Nelson Elias
4   Departament of Material Science, Instituto Militar de Engenharia, Rio de Janeiro, Brazil
,
Alexandre Sigrist de Martin
5   Departament of Endodontics, School of Dentistry, São Leopoldo Mandic, Campinas, São Paulo, Brazil
,
Carlos Eduardo da Silveira Bueno
5   Departament of Endodontics, School of Dentistry, São Leopoldo Mandic, Campinas, São Paulo, Brazil
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Abstract

Objective The aim of this study was to compare the cyclic fatigue of heat-treated and non-treated instruments.

Materials and Methods Twenty instruments with and without heat treatment from Bassi Logic were evaluated (n = 10). All instruments were subjected to dynamic cyclic fatigue through continuous rotations inside a stainless-steel tube (1.4-mm diameter, 9-mm curvature with 6-mm radius, and 90° angle) using a custom-made device, which performed 1 axial oscillation every 2 seconds with an amplitude of 3 mm, powered by a torque-controlled motor (Silver Reciproc, VDW, Germany), with speed adjusting to 950 rpm and torque to 4 N, according to manufacturer's guidance. The groups were compared using the Mann–Whitney test.

Result The fracture time of the heat-treated instruments (97.20 ± 39.94 second and non-treated instruments (14.30 ± 6.78 seconds had statistical differences [p < 0.05]). Heat-treated instruments were 6.8 times more resistant to fatigue than non-treated instruments (p < 0.05).

Conclusion Heat treatment provides increased fatigue resistance of NiTi alloy with the same design.

Keywords

endodontics - kinematics - mechanical stress - nitinol - rotation

Authors' Contributions

All authors contributed significantly to this manuscript and agreed to its submission.




Publication History

Article published online:
04 October 2022

© 2022. 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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