Corrosion resistance assessment of nickel-titanium endodontic files with and without heat treatment
Costa Tatiana Dias, da Fonseca e Silva Elison, Caetano Paula Liparini, da Silva Campos Marcio Jose, Resende Leandro Marques, Machado Andre Guimaraes, do Carmo Antonio Marcio Resende,
소속 상세정보
( Costa Tatiana Dias ) - Juiz de Fora Estacio University Center Department of Endodontics
( da Fonseca e Silva Elison ) - Federal Institute Juiz de Fora Department of Metallurgical Engineering
( Caetano Paula Liparini ) - Federal University of Juiz de Fora Department of Orthodontics
( da Silva Campos Marcio Jose ) - Federal University of Juiz de Fora Department of Orthodontics
( Resende Leandro Marques ) - Federal University of Juiz de Fora Department of Endodontics
( Machado Andre Guimaraes ) - Juiz de Fora Estacio University Center Department of Endodontics
( do Carmo Antonio Marcio Resende ) - Federal University of Juiz de Fora Department of Endodontics
Abstract
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.
키워드
Corrosion; Endodontics; Root Canal
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