Fluorescent glass ceramics and glasses with europium content

Patent metadata

Field	Value
Publication number	US-11440834-B2
Application number	US-202016784824-A
Country	US
Kind code	B2
Filing date	Feb 7, 2020
Priority date	Feb 14, 2019
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

The invention relates to glass ceramics and glasses with a europium content, containing the following components:Componentwt.-%SiO230.0 to 75.0Al2O310.0 to 45.0Europium, calculated as Eu2O30.05 to 5.0 and which are suitable in particular for the production of restorations, the fluorescence properties of which largely correspond to those of natural teeth.

First claim

The invention claimed is:

1. Process for the preparation of a dental restoration, which process comprises giving a glass ceramic with europium content or a glass ceramic comprising the glass ceramic with europium content the shape of the desired dental restoration by pressing, sintering or machining, wherein the glass ceramic with europium content comprises the following components:

Component
wt.-%

SiO 2
30.0 to 75.0

Al 2 O 3
15.0 to 45.0

Europium, calculated as Eu 2 O 3
0.05 to 5.0.

2. Process according to claim 1 wherein the glass ceramic comprises 32.0 to 72.0 wt.-% SiO 2 .

3. Process according to claim 1 wherein the glass ceramic comprises 15.0 to 40.0 wt.-% Al 2 O 3 .

4. Process according to claim 1 wherein the glass ceramic comprises 0.1 to 4.0 wt.-% europium, calculated as Eu 2 O 3 .

5. Process according to claim 1 wherein the glass ceramic comprises 8.0 to 30.0 wt.-% Me II O, wherein Me II O is selected from MgO, CaO, SrO and ZnO.

6. Process according to claim 1 wherein the glass ceramic comprises 8.0 to 30.0 wt.-% oxide selected from CaO and SrO.

7. Process according to claim 1 wherein the glass ceramic comprises at least one of the following components in the specified amounts:

Component
wt.-%

MgO
0 to 13.0

CaO
0 to 22.0

SrO
0 to 28.0

ZnO
0 to 5.0.

8. Process according to claim 1 wherein the glass ceramic comprises 0 to 10.0 wt.-% BaO.

9. Process according to claim 1 wherein the glass ceramic comprises 0 to 2.0 wt.-% tin, calculated as SnO.

10. Process according to claim 1 wherein the glass ceramic comprises 0 to 5.0 wt.-% cerium, calculated as CeO 2 .

11. Process according to claim 1 wherein the glass ceramic comprises 0 to 3.0 wt.-% B 2 O 3 .

12. Process according to claim 1 wherein the glass ceramic comprises at least one of the following components in the specified amounts:

Component
wt.-%

SiO 2
32.0 to 72.0

Al 2 O 3
15.0 to 40.0

Europium, calculated as Eu 2 O 3
0.1 to 4.0

Cerium, calculated as CeO 2
0 to 5.0

Tin, calculated as SnO
0 to 2.0

Me I 2 O
0 to 15.0

Me II O
0 to 30.0

Me III 2 O 3
0 to 10.0

Me IV O 2
0 to 15.0

Me V 2 O 5
0 to 6.0

Me VI O 3
0 to 6.0

Fluorine
0 to 5.0,

wherein
Me I 2 O is selected from Li 2 O, Na 2 O, K 2 O, Rb 2 O and Cs 2 O,
Me II O is selected from MgO, CaO, SrO and ZnO,
Me III 2 O 3 is selected from Y 2 O 3 , La 2 O 3 , Ga 2 O 3 and In 2 O 3 ,
Me IV O 2 is selected from ZrO 2 and GeO 2 ,
Me V 2 O 5 is selected from P 2 O 5 , V 2 O 5 , Ta 2 O 5 and Nb 2 O 5 and
Me VI O 3 is selected from WO 3 and MoO 3 .

13. Process according to claim 1 wherein the glass ceramic comprises at least one aluminosilicate as crystal phase.

14. Process according to claim 1 wherein the glass ceramic comprises at least 5 wt.-% aluminosilicate as crystal phase.

15. Process according to claim 1 further comprising a step in which a glass comprising the following components:

Component
wt.-%

SiO 2
30.0 to 75.0

Al 2 O 3
10.0 to 45.0

Europium, calculated as Eu 2 O 3
0.05 to 5.0.

is subjected to at least one heat treatment at a temperature of from 1000 to 1500° C.

16. Process according to claim 1 wherein the glass ceramic is present in the form of a powder, a granulate or a blank.

17. Process according to claim 1 wherein the glass ceramic exhibit fluo

Assignees

• Ivoclar Vivadent Ag

Inventors

• Dittmer Marc
• Hengst Ronny
• Ritzberger Christian

Classifications

• C03C3/095 Primary

  containing rare earths · CPC title

• A61C13/083

  Porcelain or ceramic teeth {(A61C13/081 takes precedence; preparations A61K6/80)} · CPC title

• C03C10/0054

  containing PbO, SnO2, B2O3 · CPC title

• C03C4/12

  for luminescent glass; for fluorescent glass · CPC title

• C03C10/0036 Primary

  containing SiO2, Al2O3 and a divalent metal oxide as main constituents · CPC title