Journal of Metals, Materials and Minerals

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Bioactive glasses and glass-ceramics consisting of CaO-MgO-P2O5-SiO2 system have been shown to be bioactive, resorbable and to exhibit appropriate mechanical properties for bone tissue engineering applications. Bioactive glass-ceramics scaffolds consisting of zinc doped-apatite/wollastonite (AW) glassceramics were prepared by coating polyurethane foams with sol-gel derived glass gels. Density and compressive strength of the scaffolds decreased with increased in zinc contents. In vitro bioactivity of Zndoped AW glass-ceramics in a simulated body fluid (SBF) showed the formation of apatite layer on the surface within 7 days of soaking. However, increasing Zn addition increased the chemical durability of the AW glass-ceramics, resulting in a decrease in the rate of apatite formation in a simulated body fluid. With observation by SEM technique microstructure of pores showed interconnected macropores in the range of 300-500 μm as depended on the type of sponge. Average pore size increased with increasing the zinc additions. Macropores and interconnect size can be tailored by controlling the zinc concentrations.

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