Gas releasing sealing and filling compositions
US7173075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2004 |
| Grant date | Feb 6, 2007 |
| Priority date | — |
| Expiry date | Jun 14, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2333/04
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Sealing and filling compositions for use in filling and/or sealing a root canal. The sealer and filler compositions include a polymerizable material that shrinks when polymerized. The composition also includes a gas releasing component that at least partially offsets the shrinkage caused by polymerization of the polymerizable material. The gas releasing component offsets polymerization shrinkage by creating tiny gas bubbles in the polymeric material, which causes expansion. The gas releasing component can be an acid and a base such as citric acid and sodium bicarbonate, which when mixed give off carbon dioxide. The composition can also include a dispersing agent to disperse the gas bubbles throughout the composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.