Glass ceramic as filler in polymerizable dental filling composit

Details Glass ceramic as filler in polymerizable dental filling composit Glass ceramic as filler in polymerizable dental filling composit

1974-09-11

1976-08-10

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Marking

32 15, 106 35, 106 52, 106299, 260 4253, 260 4254, C03C 322

Patent

active

039739724

ABSTRACT:
Transparent, colorless, particulate glass ceramic having a low coefficient of expansion, a high absorptivity for X-rays and which is useful in dental filling compositions, has the following ingredients, expressed as percent by weight of oxides: SiO.sub.2 40-55%, Al.sub.2 O.sub.3 15-25%, Li.sub.2 O 3-5%, P.sub.2 O.sub.5 3-10%, MgO 0-3%, ZnO 0-5%, ZrO.sub.2 2-7%, Ta.sub.2 O.sub.5 0-7% and La.sub.2 O.sub.3 >12-20%.

REFERENCES:
patent: 3801344 (1974-04-01), Dietz
patent: 3808170 (1974-04-01), Rogers

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