Papers by Keyword: Bioactive Glass-Ceramic

Abstract: Hierarchically 3D porous bioactive glasses (BGs) with various combination of both pore sizes and pore structures have been produced by multi-polymer templating, such as amphiphilic block copolymers, poly urethane (PU) forms, poly styrene (PS) beads, or methyl cellulose (MC), sol-gel method, evaporation-induced self-assembly process, and rapid prototyping technique. The amphiphilic block copolymers used for producing the meso pores into the BGs, which induces large specific surface area and subsequently carries with good bone-forming bioactivity of BGs. Each poly urethane form, poly styrene bead, and methyl cellulose adapted for the fabrication of macro pores. The rapid prototyping (RP) techniques introduced to produce 3D BGs scaffolds with giant pores.

Abstract: In silicate glasses the kinetics of apatite layer formation is usually rapid but the adhesion to the base glass is poor. Glass ceramics promote a stronger bonding between layer and substrate but decrease the rate of the apatite layer formation. In this work a glass of composition (wt%) 54,89%C3P-24,81%SiO2-20,30%MgO has been studied. This glass was heat treated at four temperatures (840 °C, 870 °C, 890 °C and 910 °C) to obtain glass ceramics with different contents of the same crystalline phase. A calcium magnesium phosphate phase was formed in all glass ceramics in a volume percent increasing with temperature. The apatite layer precipitated after immersion in simulated body fluid (SBF) formed faster on the glass than on the glass ceramics and a decrease in the amount of apatite formed was observed with the increase in crystallinity. It was generally concluded that heat treatment can turn a reactive glass into glass ceramics of different surface behaviors, from bioactive to quasi bio inert materials.