Powder of dental metal, a process for the preparation thereof, a process for the manufacture of a substructure for a dental restoration and a process for the manufacture of a dental restoration

摘要

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.