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Method for manufacturing a dental prosthesis

A denture and weight technology, applied in additive manufacturing, dentistry, dental prosthesis, etc., can solve problems such as brittleness, enhanced unfavorable characteristics, and reduced elongation at break

Active Publication Date: 2008-10-15
DENTSPLY SIRONA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In contrast to this, other alloys known from this document cannot be used, since the unfavorable properties would be enhanced by laser sintering and / or laser melting
Dentures produced also from cobalt-chromium materials by laser sintering and / or laser melting exhibit a high tendency to deform (Verzugsneigung), so that embrittlement occurs through the necessary heat treatment steps, which leads to a considerable reduction in the elongation at break
Furthermore, it shows that it reaches a particularly high hardness, which is unfavorable for mechanical post-processing

Method used

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Examples

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Embodiment Construction

[0027] In a further development, the cobalt-chromium alloy also contains 0-0.2% by weight of at least one of the elements boron, yttrium, 0-2% by weight of at least one of the elements vanadium, silicon, copper, zinc, niobium, 0-10% by weight of gallium, 0-5% by weight of germanium and 0-1% by weight of at least one of the elements cerium and lanthanum.

[0028] Independently of this, the total amount of chromium, tungsten and rhenium and / or aluminum should not be greater than 50% by weight.

[0029] In particular the ratio of chromium:tungsten+rhenium should be from about 2:3 to about 2:1 or from about 2:3 to about 3:2.

[0030] Furthermore, the content of chromium+tungsten should be at least 30% by weight and at most 50% by weight, and the ratio of chromium:tungsten should be from about 3:4 to about 4:3.

[0031] The invention is also characterized by a method for the production of dentures by layer-by-layer construction of cobalt-chromium alloy powders, in which multiple p...

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Abstract

The present invention relates to the use of a cobalt-chromium alloy in the manufacture of a dental prosthesis. The alloy contains: 43-68% by weight cobalt, 12-30% by weight chromium, 8-25% by weight tungsten, 0-13% by weight iron, 0-30% by weight manganese, 0-10% by weight molybdenum, 0-5% by weight of at least one of the elements aluminum, tantalum, rhenium, titanium and less than 0.1% by weightcarbon. A dental prosthesis with favorable workability and a low corrosion rate is obtained by manufacturing the dental prosthesis by means of a laser melting and / or sintering process.

Description

technical field [0001] The present invention relates to the use of cobalt-chromium alloys for the manufacture of dentures. The invention also relates to a method for producing a denture. Background technique [0002] In order to produce low-cost high-stiffness dentures of arbitrary geometry, it is known to manufacture dentures by laser melting or laser sintering. For this, the method known from DE-C-19649865 can in principle be used. To prepare powdered materials that are applied in successive layers on a carrier, each layer is heated with a focused laser beam before the next layer is applied in order to fix it to the underlying powder layer. [0003] Free-form sintering (Freiform-Sintern) and / or free-melting (Freiform-Schmelzen) for the production of dental articles is taught in EP-A-1568472. For this purpose, the laser or electron beam is introduced in such a way that the individual material layers to be formed are irradiated several times in order to reduce the overall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K6/04B22F3/105A61K6/884
CPCC22C1/0433B22F3/1055A61K6/043C22C19/07A61K6/842Y02P10/25B22F10/28A61C13/00
Inventor J·鲍尔A·克劳斯R·斯坦克L·韦森塞尔
Owner DENTSPLY SIRONA INC
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