Clustered particle dental fillers
Assignee3M Innovative Properties Company
InventorsMark Steven Windisch, Xiaodong Zhang, Richard Paul Rusin, Sumita Basu Mitra
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Abstract
A filler comprising a substantially amorphous cluster comprising non-heavy metal oxide particles and heavy metal oxide. The filler can be mixed into a hardenable resin to provide radiopaque dental materials having desirable strength and aesthetic character.
Claims55
A filler for dental materials comprising a substantially amorphous cluster comprising:
- non-heavy metal oxide particles, and
- amorphous heavy metal oxide particles having an average diameter of less than about 100 nm.
A filler for dental materials comprising a substantially amorphous cluster comprising:
- silica particles, and
- amorphous heavy metal oxide particles having an average diameter of less than about 100 nm.
A method of making a filler for dental material comprising:
- admixing a non-heavy metal oxide sol with a heavy metal oxide sol;
- drying said mixed sol into a dried product;
- calcining said dried product;
- and
- milling said calcined product;
- wherein said filler is a substantially amorphous cluster comprising non-heavy metal oxide particles and a heavy metal oxide.
A method of making a dental material comprising:
- admixing a non-heavy metal oxide sol with a heavy metal oxide sol;
- drying said mixed sol into a dried product;
- calcining said dried product;
- milling said calcined product;
- and
- admixing said milled product with a hardenable resin.
A filler for dental materials comprising a substantially amorphous cluster comprising:
- non-heavy metal oxide particles having an average diameter of less than about 100 nm, and
- amorphous metal oxide particles having an average diameter of less than about 100 nm,
- wherein the metal has an atomic number greater than 28, and wherein the cluster has an average diameter of less than about 5 μm.
A filler for dental materials comprising a substantially amorphous cluster comprising:
- silica particles having an average diameter of less than about 100 nm, and
- amorphous metal oxide particles having an average diameter of less than about 100 nm,
- wherein the metal has an atomic number greater than 28, and wherein the cluster has an average diameter of less than about 5 μm.
Dependencies are inferred from the claim text.