Method of making a substructure for a dental restoration

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article

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419 23, 419 36, 419 37, 433207, 433208, G22F 700

Patent

active

051436922

ABSTRACT:
A method of making a substructure for a dental restoration which comprises a substructure of a dental metal and a fired on coating of a dental ceramics, which method comprises applying a powder-form mixture of a dental metal powder and a thermoplastic polymeric material having a melting point above 50.degree. C., in the shape of the dental restoration to be made, to a porous refractory model, by means of a heated instrument, heating the assembly so obtained to a temperature at which the thermoplastic polymeric material liquefies and is sucked from the coating into the model, followed by raising the temperature of the assembly to a temperature at which the thermoplastic polymeric material disappears, and raising the temperature further to a sintering temperature at which the dental metal powder is sintered into a solid metal mass. The substructure so formed can be provided with a fired on coating of dental ceramics.

REFERENCES:
patent: 4011291 (1977-03-01), Curry
patent: 4742861 (1988-05-01), Shoher et al.
patent: 4980124 (1990-12-01), Dimmer

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