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Corrosion susceptibility of titanium covered by dental cements
Y L Turpin1, R D Tardivel, A Tallec
1Faculté de chirurgie dentaire, Laboratoire de Biomatériaux en Site Osseux, Université de Rennes 1, 2, Place Pasteur 35000 Rennes, France. nyturpin@club-internet.fr
Objectives:
The aim of this study is to determine the influence of acidic fluorinated cements (as glass ionomer (GI) cements) on the passivation of titanium, using electrochemical investigations.
Methods:
We realized experimental electrodes that associate titanium and dental cements. Polarization resistance of titanium electrodes has been determined for uncovered metal and electrodes covered with three dental cements. Student's t-tests proved the reproducibility. We also compared successive voltammograms for uncovered titanium and GI covered titanium.
Results:
Correct passivation was observed with zinc eugenate, but fluorinated GI or zinc phosphate coverage increased the corrosion susceptibility.
Significance:
However there is no evidence of titanium depassivation when covered with cement. No clinical contraindication can be held.