Abstract: A method of providing an improved bond between porcelain and a basis metal selected from gold, platinum, palladium, silver and alloys thereof, comprises depositing on the basis metal a coating of a second metal selected from gold, platinum and palladium, and then depositing on the second metal a thin layer of a third metal selected from iron, tin, zinc, copper, cobalt and indium. Heat is applied to oxidize the third metal and porcelain is fired onto the oxide so formed.

Abstract: The invention relates primary to the field of dentistry, particularly to the formation of dental crowns, and provides an apparatus for use in electrodeposition of a metal onto a plurality of substrates, which comprisesa retainer for an electrolyte,a first electrode member having means for supporting said plurality of substrates within said retainer,a second electrode member having a plurality of support zones for supporting pieces of said metal within said retainer,connecting means for mounting the first electrode member in the retainer and intended for connecting the first electrode member to one pole of a direct current supply,mounting means for mounting the second electrode member in the retainer, andmeans for making selective connection of one or more of the electrode support zones to the other pole of the direct current supply.Generally, each substrate is a tooth replica having a conductive outer coating and mounted on a metal former for screwing into the first electrode member.

Abstract: Composite metal/porcelain tooth reconstructions are manufactured by bonding porcelain to a basis metal which is pretreated by electrolytically depositing thereon a thin layer of a different metal. The pretreatment has the effect of increasing the bond strength between the metal and the porcelain.If the basis metal is a noble metal, the different metal may be deposited directly, and the porcelain then bonded on. If the basis metal is a base metal the pretreatment preferably includes an etching step, deposition of a preliminary metal layer on the etched surface, followed by deposition of the main metal layer, followed by a final deposition of metal prior to bonding to the porcelain.