Effect of mouthwashes on the electrochemical behavior of commercially pure titanium with different surface treatments

Abstract

This study aims to investigate the effect of mouthwashes solutions (0.12% diguclonate chlorhexidine; amine fluoride/stannous fluoride with 250 ppm of fluoride, 1.5% hydrogen peroxide, and 0.05% cetylperidinum cloride) on electrochemial behavior of commercially-pure titanium (cpTi) with different surface modifications (machined (surface I), modified by aluminum oxide sandblasting (surface II), modified by acid etching (surface III)). Artificial saliva at pH 6.5 will be used as an electrolyte solution. The hypothesis to be tested is that the mouthwashes will negatively affect the corrosion behavior of cpTi in the simulated oral environment; and also that the surface treatments will protect the cpTi from the corrosive action of the mouthwashes. In the electrochemical assay, standard tests such as open circuit potential, electrochemical impedance spectroscopy (EIS), and potentiodynamic tests will be conducted in the electrolyte solutions proposed. The corrosion current density (Icorr), passivation current density (Ipass), corrosion potential (Ecorr) of cpTi will be determined. The Ti oxide film properties such as capacitance (Cdl) and polarization resistance (Rp) will be investigated at initial period, and after 7 and 14 days of immersion in the electrolyte solutions. Scanning electron microscope, white light intermefometry microscope and surface roughness measurement will be used to characterize the cpTi surfaces before and after electrochemical assay. Energy dispersive spectroscopy (EDS) will be used to investigate the composition of the oxide layer formed on the cpTi surface. Additionally, the weight change of the Ti discs will be evaluated through a precision scale. Quantitative data will be statistically analyzed at a significant level of 5%.