Glass-ceramic material for dental restoration and method for producing same
US6527846B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 2001 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Feb 16, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/19
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention relates to a glass-ceramic material for dental restoration having a high crystalline leucite content. The leucite crystals are needle- or rod-shaped, have a thickness of between 0.3 and 1.5 micrometers and are between 7.5 and 20 micrometers in length. Said glass-ceramic material is substantially semi-transparent and contains, in% by weight: between 67 and 71% SiO2, between 8 and 12% Al2O3, between 3 and 5% Na2O, between 8 and 10% K2O, between 1 and 3% CaO, between 0.2 and 2% BaO, between 0.5 and 2% CeO2, between 0.2 and 1% TiO2 and between 0.5 and 2% B2O3. The above glass-ceramic material presents improved fracture strength and offers new indications for the use of full ceramic materials in dental technology, notably metal-free dental restoration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.