Dental restorative composite
US6300390A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | May 6, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K6/887
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention provides a resin-based dental restorative that exhibits low volumetric shrinkage, high filler loading and the high strength required for load bearing restorations, yet maintains a glossy appearance, even after substantial wear. To this end, a dispersant is mixed with a methacrylate resin and a structural filler having a mean particle size between about 0.05 .mu.m and about 0.50 .mu.m. The composite is useful in stress bearing restorations and in cosmetic restorations. The structural filler used is typically ground to a mean particle size of less than 0.5 .mu.m and also includes a microfill having a mean particle size less than 0.05 .mu.m to improve handling and mechanical characteristics. The preferred dental composites maintain their surface finish even after substantial use and also have the strength properties of hybrid composite resins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.