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AssigneeStiftelsen Centrum for Dentalteknik Och Biomaterial I Huddinge
InventorsLeif Hermansson, Sevald Forberg, Li Jiangou
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The present invention relates to a method to manufacture a composite ceramic material having a high strength combined with bioactive properties, when the material is used as a dental or orthopedic implant, which includes preparing a powder mixture, mainly comprising partly a first powder, which in its used chemical state will constitute a bioinert matrix in the finished material , and partly a second powder, mainly comprising a calcium phosphate-based material. The invention is characterized in that said first powder comprises at least one of the oxides belonging to the group consisting of titanium dioxide (TiO.sub.2), zirconium oxide (ZrO.sub.2) and aluminum oxide (Al.sub.2 O.sub.3), in that said second powder mainly comprises at least one of the compounds hydroxylapatite and tricalcium phosphate, in that a raw compact is made of said powder mixture and in that said raw compact is densified through an isostatic pressing in a hot condition (HIP) at a pressure higher than 50 MPa, a composite material being obtained, in which said matrix comprises one or several metal oxides of said first powder, in which matrix said compound hydroxylapatite and/or tricalcium phosphate is evenly dispersed. The invention also relates to a composite ceramic material as well as a body, completely or partially made of this material.
A method for producing a ceramic material having high strength and bioactive properties and useful as dental and orthopedic implants, comprising:
A ceramic material having high strength and bioactive properties and useful as dental and orthopedic implants, comprising a high temperature, isostatically formed shape of a matrix material containing a bioinert material selected from the group consisting of titanium dioxide, zirconium oxide, aluminum oxide and mixtures thereof and dispersed material containing a bioactive material selecteg from the group consisting of hydroxylapatite, tricalcium phosphate and mixtures thereof, wherein the bioactive material is substantially uniformly dispersed in the matrix material in amounts between about 5 and 35% by volume and in particle form having particle sizes of up to 30.mu.m with maximum mean distances between particles of about 5 .mu.m and wherein the density of the high temperature isostatically formed shape is at least 97% of theoretical maximum density, and wherein the formed shape is hot isostatically pressed at temperatures between 900 .degree.C. and 1300.degree. C. and at a pressure higher than 50 MPa.
Dependencies are inferred from the claim text.