Hydroxyapatite (HA) is the mainly inorganic composition of bones and teeth of humans and animals, with good bioactivity and biocompatibility. It can combine with bones firmly and is the main substitute materials of human bones and teeth. As the growing acknowledgement of hydroxyapatite research in recent years, people have synthesized various kinds of HA crystal structures. For instance, HA non-crystalline materials, HA microspheres materials, HA mesoporous materials, HA whiskers, HA fibers and etc..
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