Barium-free dental glass having good x-ray absorption

Details Barium-free dental glass having good x-ray absorption Barium-free dental glass having good x-ray absorption

1995-11-02

1997-06-24

Group, Karl

Compositions: coating or plastic

Coating or plastic compositions

Dental

501 55, 501 57, 501 65, 501 66, 501 67, 501 68, 501 69, 501 63, 501 64, 523116, 523117, 4332281, C03C 3076, A61K 602

Patent

active

056413475

ABSTRACT:
Disclosed is a barium-free glass of good x-ray absorption, which has a composition (in wt.-% on the oxide basis) of SiO.sub.2 50-75; ZrO.sub.2 5-30; Li.sub.2 O 0-5; Na.sub.2 O 0-25; K.sub.2 O 0-25; .SIGMA. alkali oxides 0-25. Preferred is a dental glass of the composition of SiO.sub.2 55-70; ZrO.sub.2 10-25; Li.sub.2 O 0-15; Na.sub.2 O 10-25; K.sub.2 O 0-15; .SIGMA. alkaloids 15-25. The glass can furthermore contain also up to 3 wt.-% of fluorine, up to 5 wt.-% of MgO, up to 5 wt.-% of TiO.sub.2, and in each case up to 10 wt.-% of the oxides Al.sub.2 O.sub.3, GeO.sub.2, P.sub.2 O.sub.5, La.sub.2 O.sub.3, Y.sub.2 O.sub.3, Ta.sub.2 O.sub.3, Gd.sub.2 O.sub.3, ZnO and Nb.sub.2 O.sub.5. The glass finds its use in powder form with an average particle size of .ltoreq.10 .mu.m as filler for dental composites for filling teeth.

REFERENCES:
Database WPI, Section Ch, Week 9030; Derwent Publications Ltd. London, GB; AN 90-226842 XP 02000305 & JP-A-02 153 839 (Nippon Electric Glass); 13 Jun. 1990.
Patent Abstracts of Japan, vol. 016, No. 581 (C-1012), Dec. 21, 1992 & JP-A-04 231060 (Nippon Electric Glass Co Ltd), Aug. 19, 1992.
Patent Abstracts of Japan, vol. 017, No. 627 (C-1131), Nov. 19, 1993 & JP-A-05 194130 (Hoya Corp), Aug. 3, 1993.
Patent Abstracts of Japan, vol. 017, No. 627 (C-1131), Nov. 19, 1993 & JP-A-05 194132 (Morita Mfg Co Ltd), Aug. 3, 1993.

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