A new type of machinable bioactive glass-ceramicsfor bone substitution has been developed in the glasssystem SiO2-MgO-K2O-F--CaO-P2O5, which contains Mg-muscovite [K2Mg5 (Si8O20) F4] and fluorapatite as thetwo main crystal phases. The phase separation andthe crystallization of the glass have been studied.A series of tests have showed that the material isgood at mechanical property and bioactivity. Espe-cially, by analysing the structure of the interfacelayer between the material and the bone of animalwith scanning electron microscope, electron probe,etc., it has been found that the new bone hydroxya-patite is formed on the surface of the material sothat the material is connected firmly with the bone.
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