Glass-ceramics are produced by controlled nucleation and
crystallization of glasses. The great varieties of compositions
and microstructures with specific technological properties have
allowed glass-ceramics to be used in a wide range of applications
[1]. There is great interest in glass-ceramics that possess appropriate
physical, mechanical, and biological properties for biomedical
applications. These materials should be biocompatible and in most
cases bioactive. Bioactivity is defined as the ability of biomaterials
to promote the formation of a crystalline hydroxyl apatite (HA)
layer from physiological fluid [2]. In implantology, there is considerable
interest in bioactive materials to establish strong chemical
bonding between the implant and bone, as well as to accelerate
implant anchorage by inducing an HA layer on the implant surface
[3]. Currently, several bioactive glass-ceramics are used for clinical
applications as middle-ear implant for the reconstruction of the
iliac crest and also as vertebral prostheses or dental implants [