Glass composition and glass powder, in particular for the use in the dental field
AssigneeSchott AG
InventorsSabine Pichler-Wilhelm, Jens Suffner, Simone Monika Ritter
Life of this patent
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Abstract
The present disclosure relates to a glass composition as well as a glass powder. The disclosure also relates to the use in the dental field, e.g. as dental material such as dental filling or dental restauration material, in particular as or for the production of a glass ionomer cement, for example for the treatment and/or for the filling of cavities in human and/or animal teeth and/or for tooth restoration.
Claims20
A glass comprising the following components in % by weight:
- Component
- Proportion (% by weight)
- component 1
- 22 to 42
- component 2
- 28 to 53
- component 3
- 5 to 35
- component 4
- >5 to 20
- wherein the component 1 is selected from the group consisting of SiO2, P2O5 and combinations of both,
- wherein the component 2 is selected from the group consisting of MgO, CaO, SrO, BaO, ZnO, Al2O3, Sc2O3, Y2O3, La2O3, Yb2O3, and combinations of two or more thereof,
- wherein the component 3 is selected from the group consisting of Li2O, Na2O, K2O, Cs2O, and combinations of two or more thereof,
- wherein the component 4 is F,
- wherein the glass contains at least one X-ray absorbing component of the group consisting of Y2O3, Yb2O3, La2O3, SrO, BaO, and Cs2O,
- wherein the total content of B2O3, ZnO, ZrO2 and La2O3 is less than 20% by weight, and
- wherein the glass contains less than 5% by weight of B2O3.
A glass based substance or substance mixture for the preparation of a glass ionomer cement with prolonged processing time, comprising:
- a reactive component 3 which influences the processing time of the initial cement forming reaction;
- and
- a component 4, which delays the bonding of cations at the negatively charged sites of the polyelectrolyte chain of the ionomer cement,
- wherein the ratio of the proportion by weight of the component 3 to the proportion by weight of the component 4 is at least 2.0:1.
Dependencies are inferred from the claim text.