Glass powders for dental glass ionomer cements

Details Glass powders for dental glass ionomer cements Glass powders for dental glass ionomer cements

1988-01-29

1990-02-13

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 63, 501 69, 501 70, 501 73, 106 35, 4332281, C03C 323, C03C 3247

Patent

active

049006975

ABSTRACT:
A fluoroaluminosilicate glass powder for dental glass ionomer cements has a specific gravity of 2.4 to 3.5 and a mean particle size of 0.02 to 10 .mu.m, contains in its components 20 to 50% by weight of SiO.sub.2, 20 to 40% by weight of Al.sub.2 O.sub.3, 15 to 40% by weight of SrO, 1 to 20% by weight of F.sub.2 and 0 to 15% by weight of P.sub.2 O.sub.5 on the converted oxide basis, and is substantially free from alkali metal ions such as Li, Na, K, Rb and Cs ions, and Be, Mg (and Ca) and Ba ions of alkali earth metal ions. For further improvements in physical properties, 100 parts by weight of the glass powder are surface-treated with 0.01 to 5 parts by weight of an acid and/or a fluoride.

REFERENCES:
patent: 4123416 (1978-10-01), Potter et al.
patent: 4143018 (1979-03-01), Crisp et al.
patent: 4376835 (1983-03-01), Schmitt et al.
patent: 4378248 (1983-03-01), Griffith
patent: 4744759 (1988-05-01), Bowen
patent: 4775592 (1988-10-01), Akahane et al.

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