title: Influence of fluoride on titanium in an acidic environment measured by polarization resistance technique.
abstract: The effect of sodium fluoride on the polarization resistance of titanium was investigated. Titanium plates were exposed to sodium chloride solutions with increasing fluoride concentrations. This was done at pH 7 and 4 at 37 degrees C. The polarization resistance technique was chosen because it is the only electrochemical corrosion test procedure that allows sequential measurements of the same specimen and provides a quantitative basis to estimate corrosion currents unlike measurements of the potential. The results showed a large decrease in polarization resistance with increasing fluoride concentration at pH 4. The polarization resistance at pH 7 remained constant after a slight decrease at a very high value, even with a high fluoride concentration. The results clearly confirm that titanium is attacked by fluoride in an acidic environment. The clinical implications are that fluoride rinses or fluoride gels must have a neutral pH if there is a titanium containing device in the oral environment despite the less prophylactic effectiveness.
authors.affiliation: Academic Centre for Dentistry Amsterdam (ACTA), Department of Dental Materials Science, The Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: Boere
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D003343:Corrosion; D015921:Dental Implants / Q000009:adverse effects; D004563:Electrochemistry; D005459:Fluorides / Q000009:adverse effects / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D008422:Materials Testing; D012996:Solutions; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D015921:Dental Implants; D012996:Solutions; D014025:Titanium; D005459:Fluorides