X-RAY-OPAQUE BARIUM-FREE GLASS AND USES THEREOF, ESPECIALLY IN POLYMER-BASED DENTAL COMPOSITIONS

摘要

The X-ray-opaque glass, which is free of BaO and PbO except for at most impurities, has a refractive index nd of from 1.50 to 1.58 and a high X-ray opacity with an aluminium equivalent thickness of at least 300%. The glass is based on a SiO2—Al2O3—SrO—R2O system with additions of La2O3 and ZrO2. The glass has very good chemical resistance and can be used, in particular, as a dental glass or as an optical glass.