Glass composition

Patent metadata

Field	Value
Publication number	US-10442726-B2
Application number	US-201715612544-A
Country	US
Kind code	B2
Filing date	Jun 2, 2017
Priority date	Apr 20, 2011
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A glass composition including 65 to 72 wt-% SiO 2 , at least 10.1 wt-% Li 2 O, at least 10.1 wt-% Al 2 O 3 , 0 to 2 wt-% K 2 O, at most 4 wt-% Na 2 O, 0 to 1.5 wt-% CaO, 0 to 1.5 wt-% CeO 2 , 1 to 5 wt-% P 2 O 5 , 0 to 0.5 wt-% V 2 O 5 , 0 to 1 wt-% Ag, and 0 to 1 wt-% ZrO 2 , based on a total weight of the composition. The composition is devoid of TiO 2 , Cu 2 O, BaO, Sb 2 O 3 , Nb 2 O 5 , MgO, La 2 O 3 , and SnO 2 . The proportion of Li 2 O to Al 2 O 3 in the composition is in a range of from 1:1 to 1.5:1.

First claim

The invention claimed is:

1. A glass composition comprising:
65 to 72 wt-% SiO 2 ,
at least 10.1 wt-% Li 2 O,
at least 10.1 wt-% Al 2 O 3 ,
0 to 2 wt-% K 2 O,
at most 4 wt-% Na 2 O,
0 to 1.5 wt-% CaO,
0 to 1.5 wt-% CeO 2 ,
1 to 5 wt-% P 2 O 5 ,
0 to 0.5 wt-% V 2 O 5 ,
0 to 1 wt-% Ag, and
0 to 1 wt-% ZrO 2 , based on a total weight of the composition,
wherein:
the composition is devoid of TiO 2 , Cu 2 O, BaO, Sb 2 O 3 , Nb 2 O 5 , MgO, La 2 O 3 , and SnO 2 ;
the proportion of Li 2 O to Al 2 O 3 is in a range of from 1:1 to 1.5:1; and
the composition comprises at least one of CeO 2 and V 2 O 5 in an amount greater than 0 wt. %.

2. The glass composition according to claim 1 , wherein Li 2 O is present in an amount of 15 wt-% at most and/or Al 2 O 3 is present in an amount of 15 wt-% at most.

3. The glass composition according to claim 1 , further comprising
0 to 1.5 wt-% B 2 O 3 ,
0 to 3 wt-% CaF 2 , and
0 to 2.0 wt-% AlF 3 , based on the total weight of the composition.

4. The glass composition according to claim 1 , wherein Na 2 O is present in an amount of at least 1 wt-%.

5. The glass composition according to claim 1 , essentially consisting of 0 to 2 wt-% K 2 O, at most 4 wt-% Na 2 O, 0 to 1.5 wt-% CaO, 0 to 1.5 wt-% CeO 2 , 1 to 5 wt-% P 2 O 5 , 0 to 0.05 wt-% V 2 O 5 , 0 to 1 wt-% Ag, and 0 to 1 wt-% ZrO 2 besides SiO 2 , Li 2 O, and Al 2 O 3 .

6. A glass-ceramic body produced by subjecting a basic glass body made of the glass composition according to claim 1 to a thermal treatment.

7. The glass-ceramic body according to claim 6 , further comprising at least two different crystalline phases.

8. A dental restoration comprising the glass-ceramic body according to claim 6 .

9. A dental restoration comprising the glass-ceramic body according to claim 7 .

10. The glass composition according to claim 1 , wherein V 2 O 5 is present in an amount in a range of from 0.05 wt-% to 0.5 wt-%.

11. The glass composition according to claim 1 , wherein V 2 O 5 is present in an amount in a range of from 0.05 wt-% to 0.1 wt-%.

12. A glass-ceramic body comprising:
at least two different crystalline phases, at least one of which is selected from the group consisting of LiAlSi 2 O 6 , LiAlSiO 4 , LiAlSi 3 O 8 , and LiAlSi 4 O 10 ;
wherein:
the glass-ceramic body is produced by subjecting a basic glass body made of a glass composition to a thermal treatment, the glass composition comprising:
65 to 72 wt-% SiO 2 ,
at least 10.1 wt-% Li 2 O,
at least 10.1 wt-% Al 2 O 3 ,
0 to 2 wt-% K 2 O,
at most 4 wt-% Na 2 O,
0 to 1.5 wt-% CaO,
0 to 1.5 wt-% CeO 2 ,
1 to 5 wt-% P 2 O 5 ,
0 to 0.5 wt-% V 2 O 5 ,
0 to 1 wt-% Ag, and
0 to 5 wt-% ZrO 2 , based on a total weight of the composition;

the composition is devoid of TiO 2 , Cu 2 O, BaO, Sb 2 O 3 , Nb 2 O 5 , MgO, La 2 O 3 , and SnO 2 ; and
the proportion of Li 2 O to Al 2 O 3 is in a range of from 1:1 to 1.5:1.

13. The glass-ceramic body according to claim 12 , wherein the at least two different crystalline phases further comprises a crystalline phase of Li 2 Si 2 O 5 .

Assignees

• Straumann Holding Ag

Inventors

• Borczuch-Laczka Maria
• Cholewa-Kowalska Katharzyna
• Laczka Karolina

Classifications

• A61K6/833

  Glass-ceramic composites · CPC title

• A61K6/822

  comprising rare earth metal oxides · CPC title

• A61K6/824

  comprising transition metal oxides · CPC title

• A61K6/818

  comprising zirconium oxide · CPC title

• A61K6/816

  comprising titanium oxide · CPC title