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شیشه زیست فعال
Additionally, there are other biphasic mixtures that have been investigated for biomedical applications, such as other mixtures of calcium phosphates, calcium sul- fates (Cabanas, Rodriguez-Lorenzo, and Vallet-Reg� 2002), bioactive glasses with hydroxyapatite (Ragel, Vallet-Reg�, and Rodriguez-Lorenzo 2002; Ramila et al. 2002), etc.
Among silica-based bioceramics, the most relevant materials with medical appli- cations are bioactive glasses, which are amorphous materials that were tradition- ally prepared by the classic quenching of melts comprising SiO2 and P2O5 as network formers and CaO and Na2O as network modifiers (Vallet-Reg�, Ragel, and Salinas 2003).
As will be described throughout this section, the production of bioactive glasses has evolved to the use of the sol-gel process, the relatively low synthetic temperature of which allows a greater versatility in composition and structure.
Thus it has been possible to combine the traditional composi- tion of glasses with the more modern supramolecular chemistry of surfactants to produce templated glasses, which combine the benefits of bioactive glasses composition together with a mesostructure that offers many possibilities within the biomedical research field.
Bioactive glasses were first proposed as implant materials back in 1969 by Hench (Hench et al. 1971).
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