Glass-ceramic and artificial dental crown formed therefrom

Details Glass-ceramic and artificial dental crown formed therefrom Glass-ceramic and artificial dental crown formed therefrom

1992-02-26

1993-09-21

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 5, 501 69, 501 70, 106 35, C03C 1004, C03C 1016

Patent

active

052468895

ABSTRACT:
A glass-ceramic which is excellent in mechanical strength, cutting processability and chemical durability and suitable for the production of an artificial dental crown and a mold, the glass-ceramic containing, by weight percentage, 2 to 17% of CaO, 0 to 5% of K.sub.2 O, 0 to 4% of Na.sub.2 O, the total content of K.sub.2 O and Na.sub.2 O being 0.5-7%, 15 to 35% of MgO, 30 to 49% of SiO.sub.2, 2 to 15% of ZrO.sub.2 and not more than 14% (calculated as F) of fluorine, and having a zirconia crystal and a mica crystal precipitated.

REFERENCES:
patent: 4467039 (1984-08-01), Beall et al.
patent: 5066619 (1991-11-01), Kasuga et al.

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