Zirconium dioxide based prostheses

A - Human Necessities – 61 – C

Patent

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Details

A61C 13/09 (2006.01) A61C 8/00 (2006.01) C04B 35/486 (2006.01) C04B 41/91 (2006.01) C04B 41/45 (2006.01) C04B 41/53 (2006.01)

Patent

CA 2753968

The present invention relates to a process for the manufacture of a zirconium oxide prosthesis, said zirconium oxide being stabilized, which proces comprises the following steps: a) compacting a zirconium oxide powder at a pressure of at least 45 MPa to an object of a desired form, b) impacting an etchable medium into the surface, c) optionally working the object to a final shape, d) sintering the body at a temperature of above 117O0C to transfer zirconium oxide into a tetragonal crystalline structure, and e) etching the etchable medium using hydrofluoric acid to remove the medium and impart a micromechanical retention surface. The invention also relates to a prosthesis prepared by this process.

La présente invention concerne un procédé de fabrication d'une prothèse en oxyde de zirconium, ledit oxyde de zirconium étant stabilisé. Ledit procédé comprend les étapes suivantes : a) compactage d'une poudre d'oxyde de zirconium à une pression d'au moins 45 MPa en un objet d'une forme désirée ; b) impactage d'un support pouvant être gravé sur la surface ; c) éventuellement travail de l'objet pour lui conférer une forme finale ; d) frittage du corps à une température supérieure à 117O° C pour transférer l'oxyde de zirconium en une structure cristalline tétragonale ; et e) gravure du milieu pouvant être gravé au moyen d'acide fluorhydrique pour retirer le support et lui conférer une surface de rétention mécanique. L'invention concerne en outre une prothèse préparée selon ledit procédé.

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