Metal based dental article having a coating

Patent metadata

Field	Value
Publication number	US-2016317395-A1
Application number	US-201415102472-A
Country	US
Kind code	A1
Filing date	Dec 8, 2014
Priority date	Dec 13, 2013
Publication date	Nov 3, 2016
Grant date	—

Abstract

The present disclosure provides a metal based dental article and a method of forming the metal based dental article. The metal based dental article includes a base layer, a first coating on the base layer and a second coating on the first coating. The base layer is formed from a metal substrate selected from the group consisting of a stainless steel, a titanium alloy or a nickel titanium alloy. The first coating is formed from a metal selected from the group consisting of nickel, a nickel alloy, copper, a copper alloy, zinc, a zinc alloy, tin, a tin alloy, gold or a gold alloy, where one of the first coating or the surface of the base layer has a surface roughness (R a ) from 0.1 to 1.0 microns as measured according to ASTM B46.1-2009. The second coating is formed from a metal selected from the group consisting of rhodium, a rhodium alloy, ruthenium, a ruthenium alloy, cobalt, a cobalt alloy, palladium, or a palladium alloy. The second coating has a predetermined thickness that provides the metal based dental article with a matte finish and a whiteness, L*, of at least 80 of the CIELAB color system (L*, a*, B*). t,?

First claim

1 . A metal based dental article, comprising:
a base layer formed from a metal substrate selected from the group consisting of a stainless steel, a titanium alloy or a nickel titanium alloy, the base layer having a surface in the shape of the metal based dental article; a first coating on the surface of the base layer, the first coating formed from a metal selected from the group consisting of nickel, a nickel alloy, copper, a copper alloy, zinc, a zinc alloy, tin, a tin alloy, gold or a gold alloy, where
one of the first coating or the surface of the base layer has a surface
roughness (Ra) from 0.1 to 1.0 microns as measured according to ASTM B46.1-2009; and

a second coating on the first coating, the second coating formed from a metal selected from the group consisting of rhodium, a rhodium alloy, ruthenium, a ruthenium alloy, cobalt, a cobalt alloy, palladium, or a palladium alloy, where the second coating has a predetermined thickness that provides the metal based dental article with a matte finish and a whiteness, L*, of at least 80 of the CIELAB color system (L*, a*, B*).

2 . The metal based dental article of claim 1 , where the first coating is formed from nickel having a satin finish.

3 . The metal based dental article of claim 1 , where the first coating is formed from cobalt or a cobalt alloy, the first coating having a satin finish.

4 . The metal based dental article of claim 1 , where the first coating is formed from an alloy that includes copper, zinc and tin.

5 . The metal based dental article of claim 2 , where the first coating has a thickness from greater than zero microns to 25 microns.

6 . The metal based dental article of claim 5 , where the first coating has a thickness from 5 microns to 10 microns.

7 . The metal based dental article of claim 1 , where the second coating is formed from rhodium.

8 . The metal based dental article of claim 7 , where the second coating is formed from rhodium and ruthenium.

9 . The metal based dental article of claim 7 , where the second coating is formed from rhodium and palladium.

10 . The metal based dental article of claim 1 , where the predetermined thickness of the second coating is greater than zero microns to 1 micron.

11 . The metal based dental article of claim 10 , where the predetermined thickness of the second coating is from 0.3 microns to 0.5 microns.

12 . The metal based dental article of claim 1 , where the base layer is stainless steel selected from the group of a 304L stainless steel or a 316 medical grade stainless steel.

13 . The metal based dental article of claim 1 ,where the first coating and the second coating adhere to the surface of the base layer to achieve a 0 score on a bending test according to ASTM D522-93a test method B.

14 . The metal based dental article of claim 1 , where the surface of the metal based dental article has the shape of a full crown, a partial crown, a pediatric crown, a bridge, a denture, an implant, an implant abutment, an implant healing cap, a post, a temporary restoration, an orthodontic bracket, an arch wire or a part of any one of those articles.

15 . A method of forming a metal based dental article, comprising:
providing a base layer formed from a metal substrate selected from the group consisting of a stainless steel, a titanium alloy or a nickel titanium alloy, the base layer having a surface in the shape of the metal based dental article; electroplating a first coating on the surface of the base layer using a metal selected from the group consisting of nickel, a nickel alloy, copper, a copper alloy, zinc, a zinc alloy, tin, a tin alloy, gold or a gold alloy; providing the first coating with a surface roughness (Ra) from 0.1 to 1.0 microns as measured according to ASTM B46.1-2009; and electroplating a second coating to a predetermined thickness on the first coating using a metal selected from the group consisting of rhodium, a rhodium alloy, ruthenium, a ruthenium alloy, cobalt, a cobalt alloy, palladium, or a palladium alloy, where the second coating provides the metal based dental article with a matte finish and a whiteness, L*, of at least 80 of the CIELAB color system (L*, a*, B*).

16 . The method of claim 15 , where providing the first coating with the surface roughness includes sandblasting the surface of the base layer to provide the surface roughness from 0.1 to 1.0 microns as measured according to ASTM B46.1-2009.

17 . The method of claim 15 , where providing the base layer includes selecting stainless steel as the metal substrate;
where electroplating the first coating includes using nickel to form a satin nickel finish for the first coating; and where electroplating the second coating includes using rhodium to form the matte finish and a whiteness, L*, of at least 80 of the CIELAB color system (L*, a*, B*).

18 . The method of claim 16 , including electroplating the first coating to a thickness of greater than zero microns to 25 microns; and
electroplating the second coating to a thickness of greater than zero microns to 1 micron.

19 . A method, comprising:
acquiring a metal based dental article of any one of claims 1 through Fl claim 1 ; and implanting the metal based dental article in a mouth of a patient.

20 . A kit, comprising:
a metal dental article of any one of claims 1 through Fl claim 1 ; and at least one dental component selected from the group of a cement, an adhesive, an abrasive, an instrument, instructions for application of the metal dental article or a combination thereof.

Assignees

• 3M Innovative Properties Co

Inventors

• Velamakanni Bhaskar V
• Yu Steven

Classifications

• A61K6/844

  Noble metals · CPC title

• A61K6/20

  Protective coatings for natural or artificial teeth, e.g. sealings, dye coatings or varnish · CPC title

• A61C7/12 Primary

  Brackets; Arch wires; Combinations thereof; Accessories therefor · CPC title

• A61K6/15

  Compositions characterised by their physical properties · CPC title

• A61K6/84

  comprising metals or alloys · CPC title