[Analysis of the oxides and their adherence in precious, high palladium and non precious porcelain dental alloys].

The interfacial oxides formed during the oxidation stage of porcelain dental alloys are of primary importance. The purpose of this study was to identify the type of the oxides in three commercial alloys and to evaluate their adherence with the underlying alloy before and after porcelain application. X-ray diffraction analysis revealed the presence of PdO, Fe2O3, FeO, InO, In2O3 (precious alloy), Ga2O3, GaO, PdO, CuO, SnO2 (Hi-Pd) and NiO, Gr2O3, SiO2, MoO2, TiO2, Al2O3 (non precious) in the oxide layers removed from each alloy respectively with a 10% Br solution in methanol. The highest values of tensile strength were obtained from the non-precious alloy oxides which were further enhanced after porcelain fusion. The application of porcelain does not seem to influence metal ceramic bonding.