Bariumfreies Dentalglas mit guter Röntgenabsorption

摘要

Barium-free dental glass with good X-ray absorption properties comprises the following (in wt.%): 50-75 silica, 5-30 zirconia, 0-5 lithium oxide, 0-25 sodium oxide, 0-25 potassium oxide and 0-25 alkali metal oxides (w.r.t. oxides). The glass comprises (in wt.%): 55-70 SiO2, 10-25 ZrO2, 0-5 Li2O, 10-25 Na2O, 0-25 K2O, 15-25 alkali oxides, 0-10 CaO, 0-3 F2, 0-10 SrO, 0-5 MgO, 0-10 Al2O3, 0-10 GeO2, 0-10 P2O5, 0-5 TiO2, 0-10 La2O3, 0-10 Y2O3, 0-10 Ta2O3, 0-10 Gd2O3, 0-10 ZnO, 0-10 B2O3 and 0-10 Nb2O5. The break index (nd) is 1.5-1.6, and the Al equiv. thickness is ≥ 2.5 mm. The mean particle size of the glass powder is ≤ 10 (0.5-5) mu m, and it is used as a filler for the synthetic resin tooth filling paste.