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Vol. 29. Issue 1.
Materiais 2015
Pages e15-e18 (January - April 2017)
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Vol. 29. Issue 1.
Materiais 2015
Pages e15-e18 (January - April 2017)
DOI: 10.1016/j.ctmat.2016.07.012
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Effect of heat treatments on Ni-Ti endodontic files
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F.M. Braz Fernandes, A.R. Alves, A. Machado, J.P. Oliveira
Corresponding author
jp.oliveira@campus.fct.unl.pt

Corresponding author.
CENIMAT – Centro de Investigação de Materiais, Faculdade de Ciências e Tecnologia – Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
Article information
Abstract

Three brands of rotary nickel-titanium endodontic instruments with some comparable geometric features but with different cross-section (similar tip size and same taper of .04) were selected for this study: MTwo .04(35) (VDW GmbH, Germany), K3 .04(30) (SybronEndo, Mexico) and K3XF .04(30) (SybronEndo, Mexico). K3XF is made from novel R-phase heat-treated metal alloy while all other files were made from traditional Ni-Ti alloy. The instruments were analysed under the following conditions: i) as-received (AR), ii) heat treated at 350°C, iii) heat treated at 400°C. The transformation temperatures were determined by differential scanning calorimeter (DSC). Compared to conventionally K3 and MTwo files, R-phase heat treatment K3XF file showed higher transformation temperatures. These results also showed that heat treatments increase the transformation temperatures.

Keywords:
NiTi shape memory alloys
endodontic files
heat treatments
transformation temperatures
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Copyright © 2017. Portuguese Society of Materials (SPM)
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