M. GENTE*, H.-W. GUNDLACH (Philipps-University Marburg FRG, Fa. Bego Bremen FRG)
Usually copper alloys are used as dental training metals. Because of the oxidation of the surface and the high coefficient of linear thermal expansion copper alloys can not used for metal ceramic restaurations. For fusing porcelain to metal we introduced a new nickel-chromium alloy, called "Marburger Phantommetall". This training alloy (melting interval 990 - 1085 °C) can be casted at 1220°C and it's coefficient of linear thermal expansion is 14,0-10 K-1. These properties are similar to those of noble alloys usually used for ceramic veneer techniques. The linkage of porcelain and alloy is very safe. The new alloy is not expensive and easy to handle. The "Marburger Phantommetall" is approved in our preclinical student courses for indirect fabrication of ceramic veneer crowns. Also larger dental work can be performed with this metal.