Barium-free, X-ray-opaque dental glass and dental glass/polymer composite, and the use thereof
AssigneeSchott Glas
InventorsChristian Kunert, Susanne Kessler, Hartmut Paschke, Alwin Weitzel, Ute Wolfel
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Abstract
The invention relates to a barium-free, X-ray-opaque dental glass, to a dental glass/polymer composite comprising the glass, and to the use thereof as dental filling, where the dental glass has the following composition (in % by weight): SiO2 20-45, Al2O3 5-35, B2O3 1-10, Na2O 1-10, K2O 0-8, Cs2O 0-8, sum all alkali metal oxides 1-15, CaO 0-8, SrO 0-27, ZnO 2-20, ZrO2 2-10, P2O5 0-10, La2O3 0-10, F 2-20, the total content of B2O3, ZnO, ZrO2 and La2O3 is >20% by weight, and the refractive index nd of the dental glass is in the range from 1.47 to 1.70.
Claims26
Barium-free, X-ray-opaque dental glass, characterized by a composition (in % by weight) of the following components:
- SiO2 20-45 Al2O3 5-35 B2O3 0-10 Na2O 1-10 K2O 0-8 Cs2O -8 Na2O + K2O + Cs2O 1-15 CaO 0-8 SrO 0-27 ZnO 2-20 ZrO2 2-10 P2O5 0-10 La2O3 0 to less than 10 F 11 2-20 B2O3 + ZnO + ZrO2 +La2O3 >20
- and a refractive index nd of from 1.47 to 1.70, and an aluminum equivalent thickness of at least 4 mm.
Dependencies are inferred from the claim text.