Graded glass/ceramic/glass structures for damage resistant ceramic dental and orthopedic prostheses
US7858192B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2007 |
| Grant date | Dec 28, 2010 |
| Priority date | — |
| Expiry date | Jul 25, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C14/00
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention provides a functionally graded glass/ceramic/glass sandwich system especially useful in damage resistant, ceramic dental and orthopedic prosthesis. The functionally graded glass/substrate/glass composite structure comprises an outer (aesthetic) residual glass layer, a graded glass-ceramic layer, and a dense interior ceramic. The functionally graded glass/substrate/glass composite structure may further comprise a veneer on an exterior surface. The present invention also provides a method for preparing a functionally graded glass/ceramic/glass sandwich system. A powdered glass-ceramic composition or a glass tape is applied to the accessible surfaces of a dense alumina substrate to thereby substantially cover the substrate surfaces. The glass of the composition has a CTE similar to that of the substrate material. The glass-ceramic composition is infiltrated into the dense substrate by heating the assembly to temperatures 50-700° C. below the sintering temperature of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.