Degussa Aktiengesellschaft

Manfred Stuemke

Harry Schiwiora

Werner Groll

Doris Hathaway

Gernot Schoeck

Gold-free palladium-silver alloys for dentures [dental prostheses] which alloys can be veneered without color changes with dental ceramics and can be easily removed from the mold after the casting contain 45 to 80% by weight palladium, 7 to 50% by weight silver, 0 to 5% by weight gold, 0 to 5% by weight tin, 0 to 5% by weight indium, 0 to 3% by weight zinc, 0 to 2% by weight copper, 0 to 1% by weight ruthenium, iridium and/or rhenium, 0 to 7% by weight gallium, 0 to 5% by weight cobalt and 0 to 3% by weight germanium, whereby of the elements gallium, cobalt and germanium at least two must be present with contents totalling 2 to 9% by weight.

Use of palladium-silver alloys for the manufacture of dentures

Gold preparations are used for the production of highly porous coatings on metal surfaces by means of sintering. 1 to 10% by weight of a pore former is added to these gold preparations, the pore former comprises a material which suddenly decomposes or evaporates at 700.degree. to 1050.degree. C. and escapes from the layer without leaving a residue. Plastics and dental waxes in powder form are preferably used to this end.

Gold-bearing preparation for the production of highly porous coatings

In dental technology, in order to match root posts to curved root canals, the fixation part consists of a material with mechanical properties, such as ductility and flexural rigidity, that permit topical matching of the fixation part to the curved root canal. For example, the ductility increases from the oral side of the fixation part to the root apex.

Growing community of inventors

Pforzheim, Germany

Manfred Stuemke