Surface treatment influences electrochemical stability of cpTi exposed to mouthwashes

Author(s)

Beline, Thamara ^{[1, 2]} ; Garcia, Camila S. ^[1] ; Ogawa, Erika S. ^{[1, 2]} ; Marques, Isabella S. V. ^[1] ; Matos, Adaias O. ^{[1, 2]} ; Sukotjo, Cortino ^{[3, 4]} ; Mathew, Mathew T. ^{[5, 4]} ; Mesquita, Marcelo F. ^[1] ; Consani, Rafael X. ^[1] ; Barao, Valentim A. R. ^{[1, 2]}

Affiliation

^[1] Univ Campinas UNICAMP, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, BR-13414903 Sao Paulo - Brazil

^[2] IBTN Br Inst Biomat Tribocorros & Nanomed, Brazilian Branch, Sao Paulo - Brazil

^[3] Univ Illinois, Dept Restorat Dent, Chicago, IL 60612 - USA

^[4] IBTN Inst Biomat Tribocorros & Nanomed, Chicago, IL - USA

^[5] Rush Univ, Med Ctr, Dept Orthoped Surg, Chicago, IL 60612 - USA

• Document type: Journal article
• Source: Materials Science & Engineering C-Materials for Biological Applications; v. 59, p. 1079-1088, FEB 1 2016.
• Web of Science Citations: 2

Abstract

The role of surface treatment on the electrochemical behavior of commercially pure titanium (cpTi) exposed to mouthwashes was tested. Seventy-five disks were divided into 15 groups according to surface treatment (machined, sandblasted with Al2O3, and acid etched) and electrolyte solution (artificial saliva - control, 0.12% chlorhexidine digluconate, 0.05% cetylpyridinium chloride, 0.2% sodium fluoride, and 1.5% hydrogen peroxide) (n = 5). Open-circuit-potential and electrochemical impedance spectroscopy were conducted at baseline and after 7 and 14 days of immersion in each solution. Potentiodynamic test and total weight loss of disks were performed after 14 days of immersion. Scanning electron microscopy, energy dispersive spectroscopy, white light interferometly and profilometry were conducted for surface characterization before and after the electrochernical tests. Sandblasting promoted the lowest polarization resistance (R-p) (P < .0001) and the highest capacitance (CPE) (P < .006), corrosion current density (I-corr) and corrosion rate (P < .0001). In contrast, acid etching increased R-p and reduced CPE, independent to the mouthwash; while hydrogen peroxide reduced R-p (P < .008) and increased I-corr and corrosion rate (P < .0001). The highest CPE values were found for hydrogen peroxide and 0.2% sodium fluoride. Immersion for longer period improved the electrochemical stability of cpTi (P < .05). In conclusion, acid etching enhanced the electrochemical stability of cpTi. Hydrogen peroxide and sodium fluoride reduced the resistance to corrosion of cpTi, independent to the surface treatment. Chlorhexidine gluconate and cetylpyridinium chloride did not alter the corrosive behavior of cpTi. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 13/19766-3 - Effect of mouthwashes on the electrochemical behavior of commercially pure titanium with different surface treatments
• Grantee: Camila Silveira Garcia
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 13/08451-1 - Electrochemical stability of cpTi with surfaces modified by acid etching and aluminum oxide sandblasting
• Grantee: Valentim Adelino Ricardo Barão
• Support Opportunities: Regular Research Grants