Fluoroaluminosilicate glass powder for dental glass ionomer cement

A fluoroaluminosilicate glass powder suitable as a dental glass ionomer cement, which is produced by treating the surface of a fluoroaluminosilicate glass powder with a metal fluoride or fluorocomplex salt in an amount of from about 0.01 to 5 parts by weight of said metal fluoride or fluorocomplex salt based on 100 parts by weight of the glass powder;

• and wherein said fluoroaluminosilicate glass powder comprises 25 to 50 weight percent of silica, 15 to 40 weight percent of alumina, 10 to 40 weight percent of fluoride and 0 to 20% of a phosphate;
• and wherein said metal fluoride is selected from the group consisting of a fluoride of zinc, aluminum, tin, zirconium acidic sodium;
• and said fluorocomplex salt is selected from the group consisting of potassium tetrafluoroberyllate, ammonium tetrafluoroberyllate, sodium hexafluorozirconate, potassium hexafluorozirconate, potassium heptafluoroniobate, potassium heptafluorotantalate, sodium hexafluorosilicate, potassium heptafluorosilicate, lithium hexafluorosilicate, ammonium hexafluorosilicate, iron hexafluorosilicate, nickel hexafluorosilicate, zinc hexafluorosilicate, tin hexafluorosilicate, magnesium hexafluorosilicate, sodium hexafluorotitanate, potassium hexafluorotitanate, ammonium hexafluorotitanate, nickel hexafluorotitanate, potassium tetrafluoroborate, ammonium tetrafluoroborate, manganese tetrafluoroborate, iron tetrafluoroborate, nickel tetrafluoroborate, tin tetrafluoroborate, indium tetrafluoroborate, zinc tetrafluoroborate, antimony tetrafluoroborate, and boron trifluoride-acetate complex.