Comparative analysis of the bioactivity of materials

Bioactive materials are characterized by a high rate of formation of a carbonate-containing hydroxyapatite contact layer at the implant-bone interface and by a moderate resorption capacity in weakly acidic media. In vitro tests simulating the precipitation of hydroxyapatite from interstitial tissue fluid at the surface of a material are performed to evaluate the bioactivity of a broad range of materials. The data indicate that the silicon-containing material is characterized by the highest bioactivity in the series of calcium hydroxyapatites.