1) Studies conducted by Egoshi et al, (9) showed cement bond strength was found to be high, especially after airborne-particle abrasion to base metal alloys
21, 22] The base metal alloys
mostly indicate a predominance of interface failures, suggesting a weak oxide layer at the metal-ceramic interface.
Two copper and beryllium free, commercially available Ni-Cr (Wiron 99 and Remanium CSe), base metal dental alloys were tested in this study, because base metal alloys
containing copper and beryllium are more prone to corrosion [8, 9].
Base metal alloys
are generally harder, with higher values of elastic modulus and more resistance to torsional deformation at high temperatures, but they can also be more difficult to cast and pre-weld than gold-palladium or silver-palladium alloys.
Three different Ni-Cr base metal alloys
designated for fixed prostheses manufacture were selected for the experiments: Wiron 99: 22.