OXIDATION OF NOBLE-METAL ALLOYS FOR PORCELAIN VENEER CROWNS

It has been found that oxide-forming elements in the alloy are important for the bond strength between the metal and the porcelain. The purpose of the present investigation was to study the formation of oxides during pretreatment and firing of porcelain. Four commercially available Cera-mo-Metal alloys were studied. The specimens were heated at 980 °C for five hours in air, and the weight was continuously recorded. In addition porcelain was fired on to the alloys. Metallographic examinations were conducted on both oxidized and fired specimens. The weight gain data also indicated an increased oxygen uptake with a larger amount of oxidizable elements in the alloy. Most of the oxygen gain and time indicated that the oxygen uptake was diffusion controlled. The weight gain data also indicated an increased oxygen uptake with larger amount of oxidizable elements in the alloy. Most of the oxygen in the oxidized alloys was located as oxide along grain boundaries in the metal. © 1979 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.