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US 5,702,650 AGranted
Process for producing dental prostheses
OwnerJosef Hintersehrinventor
Life of this patent
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Abstract
A process for producing ceramic dental prostheses, with which ceramic dental prostheses may be produced in the same diversity of shapes and with the same accuracy as metal dental prostheses. The process includes shaping an unfinished piece made out of 92.1 to 93.5 wt. % zirconium oxide, 4.5 to 5.5 wt. % yttrium oxide, 1.8 to 2.2 wt. % hafnium oxide, and reworking the piece to form a dental prosthesis by means of a rotating tool made of metal-bonded diamond grains.
Claims7
A process for producing a ceramic dental prosthesis, which comprises:
- (a) shaping an unfinished piece made out of 92.1 to 93.5 wt. % zirconium oxide (ZrO.sub.2), 4.5 to 5.5 wt. % yttrium oxide (Y.sub.2 O.sub.3), 1.8 to 2.2. wt. % hafnium oxide (HfO.sub.2), and up to 0.2 wt. % of any other oxides;
- and
- (b) working the unfinished piece to form a dental prosthesis by means of a rotating tool having a circumference and being made of metal-bonded diamond grains with speeds of revolution for the tool of 10,000 to 50,000 revolutions per minute, with a first movement of the tool towards the piece of 0.1 to 0.5 millimeters per minute, and a second movement of the tool perpendicular to the first movement of 0.3 to 3.0 centimeters per second, and rotational speed along the circumference of the tool of 0.5 to 9.0 m/sec.
Dependencies are inferred from the claim text.