PRE-SINTERED WORKPIECE FOR TEETH Russian patent published in 2017 - IPC C03C10/04 A61C13/83 

FIELD: glass.

SUBSTANCE: described are pre-sintered workpieces based on glass ceramics based on lithium metasilicate, which are, in particular, suitable for dental restorations making. Pre-sintered workpiece for glass ceramics based on teeth based on lithium metasilicate has relative density from 66 to 90 %, preferably, from 70 to 86 % with respect to true density of corresponding lithium disilicate based glass ceramics subjected to compaction sintering. Lithium metasilicate based glass ceramics contains, wt%: SiO₂ from 50.0 to 80.0, Li₂O from 6.0 to 20.0 and, at least, one of following components in specified amount of: Me(I)₂O up to 10.0, Me(II)O up to 12.0, Me(III)₂O₃ up to 8.0, Me(IV)O₂ up to 8.0, Me(V)₂O₅ up to 8.0, in Me(VI)O₃ up to 8.0, crystallization seed up to 8.0. Workpiece is produced by corresponding composition pressed glass powder heat treatment at temperature, preferably, of 600–700 °C, at which workpiece relative density in 30K area varies by less than for 2.5 %.

EFFECT: technical result of invention is producing of workpieces, which can be easily processed by grinding and milling and which after compaction sintering are converted into high-strength dental articles.

16 cl, 3 tbl, 18 ex, 4 dwg