CERAMIC BLOCK FOR TEETH RESTORATION, SUBJECTED TO PRE-SINTERING, ITS MANUFACTURING METHOD AND ITS USE Russian patent published in 2022 - IPC C03C10/04 C03C10/14 A61K6/802 

FIELD: dentistry.

SUBSTANCE: ceramic block for teeth restoration, subjected to pre-sintering, is proposed, which has a low pre-sintering temperature, contains silicon dioxide as the main crystal phase, but does not contain or contains small amount of a crystal phase of lithium metasilicate. The ceramic block subjected to pre-sintering contains following components, wt.%: SiO₂: 55-85, Li₂O: 10-25, ZrO₂: 0-10, Al₂O₃: 0.3-8, La₂O₃: 0-7, ZnO: 0-10, K₂O: 0.1-10, GeO₂: 0.1-7, germ-forming substance selected from a group: P₂O₅, TiO₂, V₂O₅, Cr₂O₃, and Fe₂O₃, 0-10, coloring substance: 0-10, and other additives selected from following substances: B₂O₃, F, Na₂O, BaO, SrO, CaO, and MgO, 0-15. The ceramic block pre-sintered at a temperature of 530-590°C has Vickers hardness of 0.5-3 GPa and is non-transparent. After dry mechanical processing, to impart a shape of the final product, the block is completely sintered at a temperature of 800-1100°C.

EFFECT: obtainment of a pre-sintered ceramic block suitable for dry mechanical processing.

17 cl, 18 ex, 10 tbl, 3 dwg