초록 ▼

A dental filler is disclosed. The filler is produced by admixing a metal oxide sol and a water-soluble organic binder; drying said mixed sol into a dried product; and calcining said dried product; wherein said filler is a substantially amorphous cluster. The filler can be mixed into a hardenable res

A dental filler is disclosed. The filler is produced by admixing a metal oxide sol and a water-soluble organic binder; drying said mixed sol into a dried product; and calcining said dried product; wherein said filler is a substantially amorphous cluster. The filler can be mixed into a hardenable resin to provide radiopaque dental materials having desirable strength and aesthetic character.

대표청구항 ▼

1. A method of making a filler for dental material comprising: a) admixing a non-heavy metal oxide sol, a heavy metal oxide-containing material, and a thermally fugitive water-soluble organic binder to form a mixed sol;b) drying said mixed sol into a dried product;c) heating the dried product in an

1. A method of making a filler for dental material comprising: a) admixing a non-heavy metal oxide sol, a heavy metal oxide-containing material, and a thermally fugitive water-soluble organic binder to form a mixed sol;b) drying said mixed sol into a dried product;c) heating the dried product in an oxygen-containing environment at a temperature sufficient to remove substantially all of the thermally fugitive water-soluble organic binder, to form a friable powder; andd) calcining the friable powder to form the filler as a powder;wherein said filler comprises a substantially amorphous cluster of non-heavy metal oxide particles and a heavy metal oxide. 2. The method of making a filler of claim 1, wherein the ratio of organic binder to heavy metal oxide-containing material is 0.25 to 2. 3. The method of making a filler of claim 1, wherein the ratio of organic binder to heavy metal oxide-containing material is 0.75 to 1. 4. The method of making a filler of claim 1, wherein the water-soluble organic binder comprises a sugar. 5. The method of making a filler of claim 1, wherein the water-soluble organic binder comprises a disaccharide. 6. The method of making a filler of claim 1, wherein the water-soluble organic binder comprises a trisaccharide. 7. The method of making a filler of claim 1, wherein the water-soluble organic binder comprises sucrose. 8. The method of making a filler of claim 1, wherein the water-soluble organic binder comprises polyethylene glycol. 9. The method of making a filler of claim 1, wherein the water-soluble organic binder comprises poly(vinyl alcohol). 10. The method of making a filler of claim 8, wherein upon the drying of said mixed sol into a dried product, the mixed sol becomes a foam wherein the foam expands by at least 10 percent. 11. The method according to claim 1, further comprising the step of surface modifying the filler. 12. The method according to claim 1, further comprising the step of admixing the filler with a hardenable resin.