Degussa Aktiengesellschaft

Manfred Stumke

Harry Schiwiora

Jurgen Hausselt

Werner Groll

Rudolf M Wagner

Klaus Lutz

Palladium alloys consisting of (a) 65 to 85% palladium, (b) 0 to 10% gold and/or 0 to 5% platinum, (c) 0.1 to 10% tin, (d) 1 to 10% gallium, (e) 1 to 12% copper, (f) 0.05 to 1.5% ruthenium and/or 0.05 to 0.7% rhenium as well as (g) 0.01 to 4% tungsten and/or 0.01 to 4% aluminum and/or 0.01 to 4% zinc are use to produce firmly seated and removable dentures. These alloys do not form oxide films when melted in air.

Dentures and alloys for use in same

There are applied gold containing preparations as intermediate layers for facing fired on alloys with ceramic compositions in the dental art. These gold preparations should improve the adhesiveness, form a structured surface and make possible a saving in the consumption of gold. This is accomplished with preparations that contain 60 to 95% gold powder, at least 50% of which are platelet shaped particles, 5-40% of a binder and in a given case up to 20 of a powder as an adhesive which is made of metals and/or non-metals.

Gold containing preparation for coating metallic parts (II)

Gold-containing preparations which improve the adhesiveness, guarantee an esthetic appearance, and should make possible a saving in gold consumption are needed for the production of intermediate layers for the facings of fired on alloys in the dental art with ceramic compositions. This is accomplished with preparation that contain 50 to 94% gold powder having a particle size &lt;30.mu., 5-40% binder made of organic solvent and resin components are 1-20% of a metal powder whose particle size is greater than of the gold powder used and whose melting temperature is above that of gold.

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Pforzheim, Germany

Manfred Stumke