Method of producing a sintered dental prosthesis

Details Method of producing a sintered dental prosthesis Method of producing a sintered dental prosthesis

1989-12-13

1990-11-13

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 40, 419 54, 419 57, 419 60, B22F 100

Patent

active

049700502

ABSTRACT:
A method of producing a sintered, very high density dental prosthesis from a suspension containing noble-metal powder mixtures with bi or multimodal particle-size distribution and a mixing liquid. The suspension is molded to the desired shape and then the dental prosthesis is dried. The molded dental prosthesis is then heat-treated 5 to 45 minutes between 100.degree. and 400.degree. C., then heated with an average temperature elevation of 50 to 300 K/min. to 800.degree. C. and then brought to the sintering temperature T at 20 to 200 K/min. The sintering temperature T is between T.sub.solidus - 200) and T.sub.solidus - 70), whereby T.sub.solidus is the solidus temperature of the sintered alloy. The cooling-down of the dental prosthesis takes place under a vacuum or a protective gas.

REFERENCES:
patent: 4277283 (1981-07-01), Tobioka et al.
patent: 4689197 (1987-08-01), Froll et al.
patent: 4742861 (1988-05-01), Shohen et al.
patent: 4859412 (1989-08-01), Groll et al.

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