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Synthesis and Characteriasation of Bioceramic Composites

Bioceramic materials, including bioactive glasses and glass ceramics are special compositions made typically from the Na2O-CaO-MgO-P2O5-SiO2 system. These are known to be compatible and form a mechanically strong bond with bone. The rate of bonding depends upon the nature and composition of the material. Hydroxyapatite (HA) [Ca10(PO4)6(OH)2] is a major constituent of bone and holds great promise as bioceramic material for bone implantation. The most useful property of HA is its excellent biocompatibility with the body environment. However, due to its inherent brittle nature, HA can not be used as load bearing implant material. Rather, it is used mostly in the form of surface coatings on metallic implants and also as a bone filler. In the former application, it is found that although there is continous interlocking at the tissue interface surrounding the coating, there is a weakening of the interface between the implant and the coating. This lead to the concept of using bioglass ceramics such as apatite wollastonite glass ceramics (AW), sodium bioglass ceramics (45S5) etc More Info

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