Opalescent glass-ceramic product

Details Opalescent glass-ceramic product Opalescent glass-ceramic product

2007-11-20

2007-11-20

Koslow, C. Melissa (Department: 1755)

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

C501S004000, C501S005000, C501S006000, C501S008000, C501S010000, C501S063000, C501S064000, C501S066000, C501S068000, C501S069000, C501S070000, C501S024000, C106S035000, C065S033100

Reexamination Certificate

active

10500475

ABSTRACT:
An opalescent glass-ceramic product, especially for use as a dental material or as an additive to or component of dental material, including SiO2, Al2O3, P2O5, Na2O, K2O, CaO and Me(IV))O2. In order to obtain improved opalescence with improved transparency, in addition to fluorescence, thermal expansion and a combustion temperature adapted to other materials, the opalescent ceramic product is completely or substantially devoid of ZrO2and TiO2, such that the Me(II)O content in the glass ceramic is less than approximately 4 wt % and the Me(IV)O2content amounts to approximately 0.5-3 wt %. The invention also relates to a method for the production of the opalescent glass-ceramic product.

REFERENCES:
patent: 5432130 (1995-07-01), Rheinberger et al.
patent: 5702514 (1997-12-01), Petticrew
patent: 6022819 (2000-02-01), Kaiser et al.
patent: 6120591 (2000-09-01), Brodkin et al.
patent: 6200137 (2001-03-01), Holand et al.
patent: 6280863 (2001-08-01), Frank et al.

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