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Palladium-cobalt based alloys and dental articles including the same

A technology for alloys and products, applied in the field of novel palladium-cobalt-based alloys, can solve problems such as cracking of ceramic layers

Inactive Publication Date: 2009-09-16
依华公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Any slight deformation of the metal may cause cracking of the porcelain layer

Method used

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  • Palladium-cobalt based alloys and dental articles including the same
  • Palladium-cobalt based alloys and dental articles including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 7

[0037] Examples 1 to 7 (coefficient of thermal expansion (CTE))

[0038] In order to successfully use the alloys of the present invention with contemporary used porcelains, the CTE should be in the range of about 14.0 to about 15.3. When two metals comprise the base metal of the alloy, the CTE of the alloy is expected to be between the CTEs of the two metals. It has been determined that this does not necessarily apply to palladium cobalt alloys. Given that palladium (Pd) has a CTE of 12.5 and cobalt (Co) has a CTE of 11.75, alloys of the invention including palladium / cobalt (Pd / Co) alloys have larger values, as described in the following examples, where The listed amounts are in percent by weight:

[0039] Table 1

[0040] Example number 1 2 3 4 5 6 7 PD 10 20 30 40 50 70 90 co 90 80 70 60 50 30 10 CTE 13.85 14.0 14.1 14.6 14.9 15.2 14.2

Embodiment 8 to 12

[0041] Embodiments 8 to 12 (fixed wire)

[0042] The minimum solidus temperature of the alloy of a particular embodiment of the invention was determined to be about 1025°C so that the alloy would not start to melt during casting on its surface as a ceramic.

[0043] Table 2

[0044] Example number 8 9 10 11 12 PD 65 33.8 61.8 27.0 28.2 co 35 60.4 31.0 52.3 56.0 Cr 1.2 16.2 10.0 Mo 2.4 2.0 Si 1.0 0.7 0.6 0.05 Fe 0.3 W 3.0 Ga 2.0 Al 1.2 1.6 0.35

[0045] Ta 0.8 Nb 3.0 Re 0.6 Ru 0.6 0.8 0.5 Li 0.1 0.1 0.2 B 0.2 Solid line temperature

[0046] Alloys 9 and 10 did not exhibit an unsatisfactory minimum solidus temperature.

Embodiment 13

[0048] Type: Precious Metal Porcelain / Type 4 / ISO9693

[0049] 31-VI

[0050] Composition: palladium: 28+ / —0.8%; cobalt: 55-58%; chromium: 8.0-11.0%; tungsten: 2.5-4.0%; gallium: 1.0-2.5%; (aluminum, silicon, boron and lithium: < 1.0%).

[0051] Concentration: 9.0gm / cc

[0052] Color: Crucible:

[0053] white ceramic

[0054] Complete combustion temperature: 750-820°C (1380-1510°F)

[0055] Casting temperature: 1410-1460°C (2570-2660°F)

[0056] Melting temperature: 1100-1350°C (2010-2460°F)

[0057] Oxidation period: 925°C / 5 minutes / air

[0058] Porcelain compatibility: Dizan fluorohydroxyapatite low-temperature nano-ceramic powder (IPS d.Sign); Ivoclar classic ceramic powder and new leucite medium-temperature ceramic powder (IPS Classics & Inline)

[0059] Tensile properties:

[0060] The ultimate tensile stress (U.T.S) deviates from the elastic hardness of the practical elastic limit stress (Proof Stress) elongation modulus 0.2%:

[0061] C.T.E:@25-500℃@20-600℃

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Abstract

An alloy is provided based on a palladium - cobalt binary system, has a coefficient of thermal expansion (CTE) of about 14.0 to about 15.5 and may include one or more of the following additive metals: aluminum, boron, chromium, gallium, lithium, rhenium, ruthenium, silicon, tantalum, titanium, and tungsten.

Description

technical field [0001] The invention provides a novel palladium-cobalt-based alloy. The alloy can be used in the manufacture of cast metal dental articles or restorations, and it can be used in particular for alloy-porcelain (porcelain-metal (PFM)) restorations. Background technique [0002] In the discussion that follows, reference will be made to specific structures and / or methods. However, the following description should not be read as an admission that these structures and / or methods constitute prior art. Obviously, the applicant has the right to state that these structures and / or methods are not sufficient to be called prior art. [0003] Beginning in the late 1950s, crowns, bridges, etc. were made from composites consisting of a cast metal base in which porcelain veneers were made in such a way that there was a bond between the metal and the porcelain, so that the composite is stronger than the individual components. When forming this complex, there are several as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C5/04
CPCC22C30/00C22C5/04A61K6/046C22C19/07A61K6/844
Inventor 卓迪布·达斯古普塔克莱德·英格索兰乔治·泰寿士奇
Owner 依华公司
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