Method for producing filler for microfilled dental composite material
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United States of America Patent
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Nov 1, 1988
Grant Date -
N/A
app pub date -
Jun 26, 1987
filing date -
Jun 26, 1987
priority date (Note) -
Expired
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Abstract
A filler for use in dental composites is made by the following process: (a) finely divided silica, such as fumed silica, is coated with a polymerizable monomeric material by (e.g., an acrylic monomer) by mixing the silica with an organic solvent solution of the monomer; (b) the solvent is removed by evaporation by any convenient means; (c) the coated silica particles are individualized, as by screening, to produce a powder of a predetermined particle size (e.g., 90 microns or smaller); and (d) the resin is then polymerized. Some individualization of the product of step (d) may be required. Light screening is usually sufficient.
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