ABSTRACT
Ceramic materials are increasingly used in dentistry, because of their excellent biocompatibility. Zirconia based ceramic is unique among others due to its high flexural strength. This study examined physical and mechanical properties, as well as toxic and sanitary-chemical characteristics of zirconia based ceramics to select optimum compositions, in comply with the relevant requirements for medical consumables, particularly with materials for all-ceramic frameworks. The initial powders were synthesized in the systems ZrO2-Y2O3 (I), ZrO2-Yb2O3 (II), ZrO2-Y2O3-Yb2O3 (III). Four different zirconia based ceramics were investigated. We studied specific surface of powders, phase composition of the samples, relative density and porosity, flexural strength, fracture toughness, microstructure at x10 000 magnification. Toxicological and sanitary-chemical tests were conducted in accordance with ISO10993, GOST 52770-2007, GOST R 51148-98, GN 2.3.3.972-00 etc.
