Process for providing fluorescence to a dental ceramic body
AssigneeStraumann Holding AG
InventorsAlexander Zwahlen, Marc Stephan
Life of this patent
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Abstract
A process for providing fluoresence to a dental ceramic body by treating at least a portion of the outer surface of the dental ceramic body or a precursor thereof with a bismuth containing substance, characterized by the steps of placing the dental ceramic body or the precursor thereof into a closeable container, in particular a crucible; generating a bismuth containing atmosphere in the container and exposing at least a portion of the outer surface of the dental ceramic body or of the precursor to the bismuth containing atmosphere at a temperature above 1000° C.
Claims6
A dental ceramic body based on zirconia and/or alumina comprising:
- a core region being at least essentially free of bismuth, and
- a surface region surrounding the core region and containing bismuth,
- wherein the surface region in which bismuth is contained reaches down from the surface to a depth of 500 μm at most.
A process for providing a fluorescent dental ceramic body based on zirconia and/or alumina, the process comprising:
- A) providing a ceramic precursor powder containing apart from zirconia and/or alumina, respectively, bismuth oxide in an amount that is lower than 0.7 mol-% and higher than 0.06 mol-%, and a binder,
- B) pressing the ceramic precursor powder to form a green body,
- C) debinding the green body obtained in B) to form a porous brown body, and
- D) sintering the porous brown body obtained in C) to obtain the fluorescent dental ceramic body.
Dependencies are inferred from the claim text.