Effects of different concentrations of dextrose and lipopolysaccharide on the corrosion behavior of cpTi with machined and double acid-etched surfaces

• Grant number: 12/14282-5
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: October 01, 2012
• End date: August 31, 2013
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Wirley Goncalves Assuncao
• Grantee: Leonardo Perez Faverani
• Host Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil

Abstract

This study will investigate the corrosion behavior of commercially pure titanium (cpTi) with different surfaces such as machined and modified by treatment with double acid-etching, on simulator body fluids (SFC) with different concentrations of dextrose (0; 5 mM, 7.5 mM and 15 mM) and lipopolysaccharide (LPS) (0; 0.15 µg/mL; 15 µg/mL; 150 µg/mL). The hypothesis to be tested is that the double acid-etching surface treatment will generate a different pattern of corrosion from that observed in the machined surface in both the combination of dextrose and LPS, and when these substances are evaluated separately. Further, it is hypothesized that the presence of dextrose and LPS will decrease the corrosion resistance of cpTi. CpTi disks will be fabricated with different surfaces as described above. For electrochemical assay (n = 5), open circuit potential, electrochemical impedance spectroscopy (EIS) and potentiodynamic tests will be conducted in SBF with different concentrations of dextrose and LPS. The corrosion current density (Icorr), the passivation current density (Ipass), the corrosion potential (Ecorr), capacitance (Cdl) and polarization resistance (Rp) of Ti oxide layer will be determined. The surfaces of the disks will be characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) and by surface roughness and microhardness. The energy dispersive spectrometry (EDS) will be used to evaluate the composition of the oxides formed on the cpTi surface. The obtained quantitative data will be statistically analyzed with the appropriate test with a significance level of 5%.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FAVERANI, LEONARDO P.; ASSUNCAO, WIRLEY G.; DE CARVALHO, PAULO SERGIO P.; YUAN, JUDY CHIA-CHUN; SUKOTJO, CORTINO; MATHEW, MATHEW T.; BARAO, VALENTIM A.. Effects of Dextrose and Lipopolysaccharide on the Corrosion Behavior of a Ti-6Al-4V Alloy with a Smooth Surface or Treated with Double-Acid-Etching. PLoS One, v. 9, n. 3, MAR 26 2014. (11/20021-7, 12/14282-5)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

FAVERANI, Leonardo Perez. Efeitos de diferentes concentrações de dextrose e lipopolissacarídeo no comportamento corrosivo da liga Ti-6Al-4V com superfície usinada e tratada com duplo ataque ácido. 2013. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araçatuba Araçatuba.