Palladium based alloys

Patent metadata

Field	Value
Publication number	US-10653585-B2
Application number	US-201816136887-A
Country	US
Kind code	B2
Filing date	Sep 20, 2018
Priority date	Mar 9, 2012
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A palladium-based alloy having a coefficient of thermal expansion (CTE) of about 12.0 to about 13.0 and having one or more of the following additive metals: platinum, gallium, chromium, molybdenum, tin, silicon, ruthenium, rhenium, indium, tungsten, niobium, boron and lithium.

First claim

We claim:

1. A dental article comprising;
a dental alloy substrate free of gold, copper, silver and cobalt comprising palladium, platinum, gallium, molybdenum, chromium, ruthenium and rhenium and having a CTE in the range of about 11.5 to about 13.0×10 −6 /° C. at 25-500° C.; and
a ceramic or glass ceramic having a CTE in the range of about 8.0 to about 13×10 −6 /° C. at 25-500° C. pressed onto the dental alloy substrate.

2. The dental article of claim 1 , wherein the CTE of the dental alloy is in the range of about 12 to about 13.0×10 −6 /° C. at 25-500° C.

3. The dental article of claim 1 , wherein the CTE of the ceramic or glass ceramic is in the range of about 9 to about 12.5×10 −6 /° C. at 25-500° C.

4. The dental article of claim 1 , wherein the ceramic or glass ceramic comprises lithium silicate.

5. The dental article of claim 4 , wherein the lithium silicate comprises lithium metasilicate, lithium disilicate or a mixture thereof.

6. The dental article of claim 1 fabricated as a crown, bridge, veneer, inlay, onlay, partial crown, fixed partial denture, implant abutment, implant, orthodontic appliance, space maintainer, tooth replacement appliance, splint, dentures, post, teeth, jacket, facing, veneer, facet, cylinder, or connector.

7. The dental article of claim 1 , wherein the dental alloy substrate comprises a range of elements as follows:

palladium
about 74.5 to about 88.5

platinum
about 0.1 to about 8.0

gallium
about 1.7 to about 9  

molybdenum
about 0.5 to about 5.0

ruthenium
about 0.1 to about 0.8

rhenium
about 0.1 to about 0.8

chromium
 about 0.1 to about 6.0.

8. The dental article of claim 7 wherein the dental alloy substrate further comprises one or more of the following in weight percent:

tin
0 to about 7.0

indium
0 to about 7.0

niobium
0 to about 1.5

tungsten
0 to about 4.0

boron
0 to about 0.1

lithium
0 to about 0.1

silicon
0 to about 1.2

tantalum
0 to about 1

9. The dental article of claim 1 , wherein the wherein the chromium is at least about 0.5 percent by weight of the total alloy.

10. The dental article of claim 1 , wherein the platinum is no higher than 8% percent by weight of the total alloy.

11. The dental article of claim 1 , wherein the chromium is at least about 0.1 percent by weight of the total alloy.

12. The dental article of claim 1 , wherein the molybdenum is at least about 0.1 percent by weight of the total alloy.

13. The dental article of claim 1 further comprising an opaque layer between the dental alloy substrate and the ceramic or glass ceramic.

14. The dental article of claim 13 wherein the opaque layer has a CTE in the range of about 9.0 to about 13.0×10 −6 /° C. at 25-500° C.

15. The dental article of claim 13 wherein the opaque layer has a CTE in the range of about 10.8 to about 12.0×10 −6 /° C. at 25-500° C.

16. The dental article of claim 1 wherein the dental alloy is non-magnetic.

17. The dental article of claim 1 wherein the amount of Pt is not higher than 8.0 weight percent, an amount of one or more grain refiners is not less than 0.10 weight percent, and one or more of Cr, W, and Nb is at least 3.5 weight percent.

18. A dental alloy free of gold, copper, silver and cobalt comprising palladium, platinum, gallium, molybdenum, chromium, ruthenium and rhenium and having a CTE in the range of about 11.5 to about 13.0×10 −6 /° C. at 25-500° C.

19. A dental alloy of claim 18 wherein the CTE is in the range of about 12 to about 13.0×10 −6 /° C. at 25-500° C.

20. The dental alloy of claim 18 wherein the chromium is at least about 0.1 percent by weight of the total alloy.

21. The dental alloy of claim 18 wherein the platinum is no higher than 8% percent by weight of the total alloy.

22. The dental alloy of claim 18 having a solidus melting temperature in the range of about 980° C. to about 1250° C.

23. The dental alloy of claim 18 having a liquidus melting temperature in the range of about 1150° C. to about 1380° C.

24. A dental article comprising;
a dental alloy substrate free of gold, copper, silver and cobalt comprising palladium, platinum, gallium, molybdenum, chromium, ruthenium and rhenium and having a CTE in the range of about 11.5 to about 13.0×10 −6 /° C. at 25-500° C.;
a ceramic or glass ceramic having a CTE in the range of about 9.0 to about 13×10 −6 /° C. at 25-500° C. pressed onto the dental alloy substrate; and
an opaque layer applied between the dental alloy substrate and the ceramic or glass ceramic having a CTE in the range of about 9.0 to about 13.0×10 −6 /° C. at 25-500° C.

Assignees

• Ivoclar Vivadent Ag
• Ivoclar Vivadent Inc

Inventors

• Dasgupta Tridib
• Tysowsky George

Classifications

• C22C5/04 Primary

  Alloys based on a platinum group metal · CPC title

• B32B2535/00

  Medical equipment, e.g. bandage, prostheses or catheter · CPC title

• A61K6/842 Primary

  Rare earth metals · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title

• A61K6/802

  comprising ceramics · CPC title