Blank for dental purposes

Patent metadata

Field	Value
Publication number	US-10064708-B2
Application number	US-201414762612-A
Country	US
Kind code	B2
Filing date	Feb 7, 2014
Priority date	Feb 12, 2013
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

Blanks for dental purposes are described which have at least two layers, bonded to one another, of lithium silicate glasses and glass ceramics, wherein the layers differ in color and the layers are monolithic.

First claim

The invention claimed is:

1. Blank for dental purposes which has at least 2 layers, bonded to one another, of
lithium silicate glass,
lithium silicate glass with nuclei or
lithium metasilicate glass ceramic,
wherein the layers differ in colour and the layers are monolithic.

2. Blank according to claim 1 which has layers of lithium silicate glass with nuclei or layers of lithium metasilicate glass ceramic.

3. Blank according to claim 1 , in which the lithium metasilicate glass ceramic comprises lithium metasilicate as main crystal phase and comprises more than 5 vol.-% lithium metasilicate crystals.

4. Blank according to claim 3 , in which the lithium metasilicate glass ceramic comprises lithium metasilicate as main crystal phase and comprises more than 10 vol.-% lithium metasilicate crystals.

5. Blank according to claim 3 , in which the lithium metasilicate glass ceramic comprises lithium metasilicate as main crystal phase and comprises more than 20 vol.-% lithium metasilicate crystals.

6. Blank according to claim 1 , in which the lithium silicate glass, the lithium silicate glass with nuclei, and the lithium metasilicate glass ceramic comprise at least one of the following components in the given amounts:

Component
wt.-%

SiO 2
50.0 to 80.0

Li 2 O
6.0 to 20.0

Me(I) 2 O
0 to 10.0,

Me(II)O
0 to 12.0,

Me(III) 2 O 3
0 to 8.0,

Me(IV)O 2
0 to 8.0,

Me(V) 2 O 5
0 to 8.0,

Me(VI)O 3
0 to 8.0,

nucleating agent
0 to 8.0, ,

wherein

Me(I) 2 O is selected from Na 2 O, K 2 O, Rb 2 O, Cs 2 O or mixtures thereof,

Me(II)O is selected from CaO, BaO, MgO, SrO, ZnO and mixtures thereof,

Me(III) 2 O 3 is selected from Al 2 O 3 , La 2 O 3 , Bi 2 O 3 , Y 2 O 3 , Yb 2 O 3 and mixtures thereof,

Me(IV)O 2 is selected from ZrO 2 , TiO 2 , SnO 2 , GeO 2 and mixtures thereof,

Me(V) 2 O 5 is selected from Ta 2 O 5 , Nb 2 O 5 and mixtures thereof,

Me(VI)O 3 is selected from WO 3 , MoO 3 and mixtures thereof, and

nucleating agent is selected from P 2 O 5 , metals and mixtures thereof.

7. Blank according to claim 6 , in which the lithium silicate glass, the lithium silicate glass with nuclei, and the lithium metasilicate glass ceramic comprise at least one of the following components in the given amounts:

Component
wt.-%

SiO 2
65.00 to 75.00

Li 2 O
14.00 to 16.00

K 2 O
2.00 to 5.00

SrO and CaO
0 to 2.00

MgO
0 to 2.00

ZnO
0 to 2.00

Al 2 O 3
1.50 to 3.50

La 2 O 3
0 to 2.00

ZrO 2
0 to 4.00

P 2 O 5
2.50 to 4.00.

8. Blank according to claim 6 , in which the following components are present in the given amounts:

Component
wt.-%

SiO 2
50.0 to 80.0

Li 2 O
6.0 to 20.0

Me(I) 2 O
0.1 to 10.0

Me(II)O
0.1 to 12.0

Me(III) 2 O 3
0.1 to 8.0

Me(IV)O 2
0.1 to 8.0

Me(V) 2 O 5
0.1 to 8.0

Me(VI)O 3
0.1 to 8.0

nucleating agent
0.1 to 8.0.

9. Blank according to claim 1 , which has a holding means for a processing device, wherein the holding means consists of metal or plastic.

10. Method of using the blank according to claim 1 comprising producing a dental restoration from the blank, wherein the dental restoration comprises a crown, abutment, abutment crown, inlay, onlay, veneer, shell, bridge or overstructure.

11. Process for producing the blank with la

Assignees

• Ivoclar Vivadent Ag

Inventors

• Bürke Harald
• Tauch Diana
• Schweiger Marcel
• Höland Wolfram
• Ritzberger Christian
• Rheinberger Volker

Classifications

• C03C8/24

  Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders · CPC title

• C03B23/20

  Uniting glass pieces by fusing without substantial reshaping · CPC title

• A61C13/083

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

• A61C13/0022

  Blanks or green, unfinished dental restoration parts · CPC title

• A61C5/77

  Methods or devices for making crowns · CPC title