Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Post sintering operation
Patent
1993-06-10
1994-11-08
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Post sintering operation
419 35, 419 47, 433207, 433208, B22F 500, B22F 700, A61C 1308
Patent
active
053624386
ABSTRACT:
This invention relates to a powder substantially of dental metal, which powder is suitable for the manufacture of a dental restoration such as a crown or a bridge, comprising a substructure of dental metal and a fired on coating of a dental ceramic material. The powder comprises a core substantially of a dental metal, which core is coated with one or more layers substantially of metal which protect the dental metal of the core during sintering against oxidation and/or reduce the temperature at which the powder is sintered.
The invention also relates to a process for the manufacture of a dental restoration such as a crown or a bridge, comprising a substructure of a dental metal and a fired on coating of a dental ceramic material. This process comprises mixing a powder substantially of dental metal into a paste-like slurry, placing on a refractory model the resulting paste in the form of the restoration to be made, heating the composite thus obtained to a temperature sufficient to sinter the powder of dental metal to a massive metal mass, and firing on a coating of a dental ceramic material on the substructure thus obtained, optionally after finishing the surface. As powder of dental metal the powder according to the invention is used.
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Elephant Edelmetaal B.V.
Jenkins Daniel J.
Walsh Donald P.
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