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US 4,772,436 AGranted
Process for the preparation of a dental prosthesis by slight solid phase fritting of a metal oxide based infrastructure
OwnerMichele Tyszblatinventor
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Abstract
A method for manufacturing a dental prosthesis from a shaped, slightly solid phase fritted metal oxide infrastructure whose pores are impregnated with a glass by molding a tooth model from a linearly expanding molding mass and contacting the model with a slip of metal oxide particles which particles are agglomerated onto the model. The agglomerated metal oxide particles forming an infrastructure which is shaped and baked to effect dehydration and withdrawal of the model from the infrastructure before the fritting and glass impregnation of the infrastructure.
Claims29
A method for manufacturing ceramic dental prosthesis comprising
- molding a model of a tooth that is to receive said prosthesis from a molding mass that slightly expands linearly on solidification,
- preparing a slip comprising an aqueous suspension of metal oxide particles to which has been added a suspension stabilization agent;
- contacting said model of said tooth with said slip until a layer of agglomerated metal oxide particles has been achieved,
- imparting to said layer of agglomerated metal oxide particles an outer shape desired for an infrastructure of said prosthesis,
- baking said model of said tooth coated with said metal oxide based infrastructure to effect initially a dehydration of said model of said tooth thereby causing withdrawal of said model from said infrastructure,
- slightly solid phase fritting the metal oxide based infrastructure to produce a binding between said metal oxide particles without causing a substantial volumetric reduction of said infrastructure, and then
- impregnating said infrastructure with glass at a temperature such that all pores of said infrastructure are filled with said glass, thereby producing said prosthesis.
4 more elements
Dependencies are inferred from the claim text.