Glass ceramic having a quartz solid solution phase
Quartz solid solution glass ceramics and precursors thereof are described, which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.
1. Process for preparing a dental restoration comprising forming a glass ceramic, which comprises a quartz solid solution phase and comprises the following components
Component
wt.-%
SiO 2
37.0 to 50.0
Al 2 O 3
25.0 to 39.0
MgO
5.0 to 15.0
ZrO 2
13.5 to 19.0,
into a dental restoration.
2. Process according to claim 1 , wherein the glass ceramic comprises 38.0 to 49.0 wt.-% SiO 2 .
3. Process according to claim 1 , wherein the glass ceramic comprises 26.0 to 38.0 wt.-% Al 2 O 3 .
4. Process according to claim 1 , wherein the glass ceramic comprises 6.0 to 14.0 wt.-% MgO.
5. Process according to claim 1 , wherein the glass ceramic comprises 14.0 to 18.0 wt.-% ZrO 2 .
6. Process according to claim 1 , wherein the glass ceramic comprises at least one of the additional following components:
Component
wt.-%
Li 2 O
0 to 1.0
Na 2 O
0 to 1.0
K 2 O
0 to 1.0
CaO
0 to 2.5
SrO
0 to 4.0
ZnO
0 to 15.0
B 2 O 3
0 to 1.0.
7. Process according to claim 1 , wherein the glass ceramic comprises the quartz solid solution phase as main crystal phase.
8. Process according to claim 1 , wherein the glass ceramic comprises a high-quartz solid solution phase, a low-quartz solid solution phase or a mixture thereof.
9. Process according to claim 8 , wherein the glass ceramic comprises the high-quartz solid solution phase in a higher amount than the low-quartz solid solution phase.
10. Process according to claim 8 , wherein the glass ceramic comprises the high-quartz solid solution phase as main crystal phase.
11. Process according to claim 8 , wherein the glass ceramic comprises the low-quartz solid solution phase in a higher amount than the high-quartz solid solution phase.
12. Process according to claim 8 , wherein the glass ceramic comprises the low-quartz solid solution phase as main crystal phase.
13. Process according to claim 1 , which comprises zirconium oxide as a crystal phase.
14. Process according to claim 1 , wherein the glass ceramic is present in the form of a powder or a blank.
15. Process according to claim 1 , wherein the glass ceramic is given, by machining, the shape of the desired dental restoration.
16. Process according to claim 1 , wherein the dental restoration is a bridge, inlay, onlay, veneer, abutment, partial crown, crown or facet.
17. Process for preparing a dental restoration comprising forming a starting glass, which comprises the following components
Component
wt.-%
SiO 2
37.0 to 50.0
Al 2 O 3
25.0 to 39.0
MgO
5.0 to 15.0
ZrO 2
13.5 to 19.0,
into a dental restoration.
18. Process according to claim 17 , wherein the starting glass comprises nuclei for the crystallization of a quartz solid solution phase.
19. Process according to claim 17 , wherein the starting glass is given, by machining, the shape of the desired dental restoration.
20. Process according to claim 17 , wherein the dental restoration is a bridge, inlay, onlay, veneer, abutment, partial crown, crown or facet.
21. Process according to claim 9 , wherein the glass ceramic with a higher amount of high-quartz solid solution phase is given the shape of the desired dental restoration by machining.