View of improvement of Quality of life (QOL) for senior citizens, the implant treatment that embed prosthesis into a living body has advanced as a method of treating for deterioration or a lesion part. Titanium is one of major metal materials for implant and has the helpful feature called “Osseointegration” which is bonding phenomenon to living bone directly. However, Osseointegration needs to 2 ∼ 3 months of no-load state for fixing between implants and living bones. Therefore, the addition technique of biocompatible coatings, mainly Hydroxyapatite (Ca
10(PO
4)
6(OH)
2, HAp) , onto the surface of titanium alloy implants has been developed to reduce duration of fixing period between implants and living bones and to improve the strength of treated part. In addition, such coatings have another function as the barriers to protect corrosion from living body environment and to prevent release metallic ions from implants. This paper introduces past and current research status of biocompatible coatings related issue, i.e., its corrosion barrier function, fabrication methods and each feature, influences of investigation environment ( “in vitro” or “in vivo” and “clinical” ) , structure-complexable and multi-functionalization.
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