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Calcium phosphate formation on porous sol-gel-derived SiO2 and CaO-P2O5-SiO2 substratesin vitro

✍ Scribed by Peltola, T. ;Jokinen, M. ;Rahiala, H. ;Lev�nen, E. ;Rosenholm, J. B. ;Kangasniemi, I. ;Yli-Urpo, A.

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
621 KB
Volume
44
Category
Article
ISSN
0021-9304

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✦ Synopsis

Sol-gel-derived SiO 2 and CaO-P 2 O 5 -SiO 2 have been shown to be bioactive and bone bonding. In this study bioactive sol-gel-derived SiO 2 and CaO-P 2 O 5 -SiO 2 systems were tested for in in vitro bioactivity. The calcined ceramic monoliths were immersed in a simulated body fluid and analyzed to follow the hydroxyapatite formation on the ceramic surface. Apatite-forming ability was investigated in terms of structural changes by changing the composition and the preparation method. The role of Ca and P dopants in the substrate structure is complicated, and careful characterization is needed. The composition and structure together determine the in vitro bioactivity. The pore structure was analyzed using N 2 -adsorption/desorption isotherms. The results indicate that a great mesopore volume and a wide mesopore size distribution favor hydroxycarbonate apatite nucleation and a great surface area is not needed. The performed preparation process for silica in a basic environment provides a convenient way to prepare a mesoporous material.

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