Evaluation of corrosion behavior and some mechanical properties of silver-rich, 2 free amalgam

Corrosion behaviour, creep resistance, compressive and tensile strength and hardness of a newly developed silver-rich commercial amalgam were investigated in order to evaluate its performance, as compared with three high copper amalgams, namely; admixed, unicompositional and Pd-enriched. The results have shown that Ag-rich amalgam was superior in corrosion behaviour, compressive and tensile strength. Creep values were comparable to those of Pd-enriched amalgam, whereas hardness measurements of the latter were significantly higher. The results were analysed on a compositional and microstructural bases

Corrosion and metallurgical study of some porcelain fused to metal alloys

In order to evaluate the corrosion behavior of some dental alloys to be applied as base-metal for PFM, electrochemical technique and metallurgical investigation were used. Potentiodynamic and potentiostatic tests were carried out under deaerated and aerated conditions in 1 percent NaCl solution. The results have shown that Ni-Cr alloy has a superior corrosion resistance under deaerated conditions, whereas Co-Cr alloy has a stronger tendency to passivation under aerated conditions. Fe-Cr alloy has demonstrated a poor performance. The results were analyzed on compositional and microstructural bases