Corrosion resistance assessment of nickel-titanium endodontic files with and without heat treatment
Autor: | Leandro Marques de Resende, Elison da Fonseca e Silva, André Guimarães Machado, Antônio Márcio Resende do Carmo, Paula Liparini Caetano, Tatiana Dias Costa, Marcio José da Silva Campos |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Corrosion potential
medicine.medical_specialty Materials science Root canal Metallurgy 030206 dentistry 02 engineering and technology General Medicine 021001 nanoscience & nanotechnology Endodontics Corrosion 03 medical and health sciences 0302 clinical medicine Sodium hypochlorite solution medicine.anatomical_structure Nickel titanium Endodontic files Pitting corrosion medicine Root Canal 0210 nano-technology Research Article |
Zdroj: | Restorative Dentistry & Endodontics |
ISSN: | 2234-7666 2234-7658 |
Popis: | Objectives The aim of this study was to evaluate the corrosion resistance of heat-treated (Reciproc and WaveOne) and non-heat-treated (ProTaper and Mtwo) superelastic nickel-titanium endodontic files when immersed in a 5.25% sodium hypochlorite solution. Materials and Methods Anodic polarization curves were obtained with potential sweeps that began at the open circuit potential or corrosion potential (Ecorr). The pitting potential (Epit) was identified on the anodic polarization curve as the potential at which a sudden increase in current was observed. The micromorphology of the 28 tested files was analyzed before and after the electrochemical assay using scanning electron microscope (SEM). The data were analyzed using 1-way analysis of variance with the post hoc Bonferroni test (for Ecorr) and the Student t-test for independent samples (for Epit). Results The mean Ecorr values were 0.506 V for ProTaper, 0.348 V for Mtwo, 0.542 V for Reciproc, and 0.321 V for WaveOne files. Only WaveOne and Protaper files exhibited pitting corrosion, with Epit values of 0.879 V and 0.904 V, respectively. On the SEM images of the ProTaper and WaveOne files, cavities suggestive of pitting corrosion were detected. Conclusions Signs of corrosion were observed in both heat-treated and non-heat-treated files. Of the evaluated files, WaveOne (a heat-treated file) and ProTaper (a non-heat-treated file) exhibited the lowest corrosion resistance. |
Databáze: | OpenAIRE |
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