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The corrosion of nickel–titanium rotary endodontic instruments in sodium hypochlorite
Author(s) -
Nóvoa X. R.,
MartinBiedma B.,
VarelaPatiño P.,
Collazo A.,
MacíasLuaces A.,
Cantatore G.,
Pérez M. C.,
MagánMuñoz F.
Publication year - 2007
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2006.01178.x
Subject(s) - corrosion , materials science , sodium hypochlorite , galvanic cell , metallurgy , potentiostat , nickel titanium , electrochemistry , alloy , passivation , galvanic corrosion , electrode , composite material , chemistry , shape memory alloy , organic chemistry , layer (electronics)
Aim To evaluate the corrosion resistance of nickel–titanium (NiTi) endodontic rotary instruments immersed in 5.25% sodium hypochlorite (NaOCl) solution. Methodology The corrosion performance of NiTi instruments (S1 25 mm, ProTaper Dentsplay Maillefer, Ballaigues, Switzerland) was evaluated using commercial 5.25% NaOCl solution (pH = 12.3), and the same solution partially neutralized adding H 2 SO 4 to reach pH = 10.1. Electrochemical measurements were carried out using a potentiostat equipped with a five‐channel zero resistance ammeter (ZRA) for galvanic current measurements. The instruments were sectioned into three parts (cutting part, noncutting part and shank) and degreased with acetone and rinsing with demineralized water prior to being immersed in NaOCl solution for testing. Each set of the three parts constituted one ‘virtual’ instrument through the ZRA, giving access to the galvanic currents that circulate between the three parts. Nine instruments were employed to check the reproducibility of the electrochemical measurements. Results The corrosion potential (E corr ) of the NiTi alloy reached the passive domain in approximately 20 s of immersion in the solution having a pH 10.1. After this initial period the potential remained steady, indicating that stable passivation was achieved. However, at pH 12.3 no stationary state was achieved even after 6000 s of immersion time. Thus, the alloy was not stable in this medium from a corrosion point of view. Conclusions The corrosion resistance of NiTi alloy was enhanced by lowering the pH of NaOCl solution to 10.1, which allows the system to reach the stability domain of the passivating species TiO 2 and NiO 2 .