Leucite glass ceramics

US9856165B2 · kind B2 · utility

Assignee

• Queen Mary & Westfield College, University of London · GB

Inventors

• Antonios Theocharopoulos · Cork, IE
• Xiaohui Chen · Manchester, GB
• Natalia Karpukhina · London, GB
• Robert Graham Hill · Downpatrick, GB
• Mike Cattell · London, GB

Key dates

• Filing date: Jun 27, 2014
• Grant date: Jan 2, 2018
• Expiry date: Jun 27, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C10/0054
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A leucite glass-ceramic is prepared from a glass comprising: about 66.8 to about 71.9 mol % of SiO2, about 8.5 to about 10.6 mol % of Al2O3, about 9.5 to about 12.8 mol % of K2O, about 0.5 to about 4.0 mol % of CaO, about 0 to about 3.0 mol % of TiO2, about 1.8 to about 4.0 mol % of Na2O, about 0.1 to about 6.0 mol % of Li2O, about 0 to about 1.0 mol % of MgO, about 0 to about 3.0 mol % of Nb2O5, and about 0 to about 3.0 mol % of B2O3. The leucite glass-ceramic is prepared by subjecting the glass components to a nucleation heat treatment, followed by a growth heat treatment. The leucite glass-ceramic may be used in the fabrication of a Dental restoration using various processes, and may be used in the construction of Dental restorations such as ceramic Dental inlays, crowns, veneers, bridges, veneering materials for zirconium oxide restoration substrates, alumina oxide restoration substrates, or metal restoration substrates.