Method for producing tooth parts from dental metal powder
AssigneeWDT-Wolz-Dental-Technik GmbH
InventorStefan Wolz
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for producing tooth parts from dental-grade metal powder, wherein existing CAD/CAM milling machines can be used. The essential process steps consist of: a) preparing a slurry from dental-grade metal powder, b) casting the slurry into a mold, c) drawing out (drying) suspension liquid (water) until a mechanically stable blank is obtained, d) milling the blank into the desired shape, e) oxygen-free sintering of the tooth parts milled from the blank. Because the blank is still present as a green body, milling does not place great demands on the milling machine in terms of mechanical stability and dust development. As a result, the operating speed and the service lives of customary milling machines are substantially increased.
Claims9
A method for producing tooth parts having a desired shape from dental-grade metal powder, characterized by the process steps:
- a) preparing a slip of dental-grade metal alloy powder, consisting of chromium cobalt (CrCo) alloy, with a suspension liquid and an admixture of organic compounds,
- b) pouring this slip into a mold,
- c) drawing the suspension liquid out of the poured slip to produce a reduced concentration gradient such that the resulting concentration gradient of the suspension liquid prevents the admixture of organic compounds from emerging on a surface of the slip until a mechanically stable green blank is obtained,
- d) following step c) and before step e), milling the green blank to the desired shape, and
- e) oxygen-free sintering the tooth parts that have been milled from the green blank, including expelling oxygen by introduction of argon into a sintering furnace.
Dependencies are inferred from the claim text.