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Electrochemically Deposited Ca(OH){sub}2 Coatings as a Bactericidal and Osteointegrative Modification of Ti Implants
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机译：Electrochemically Deposited Ca(OH){sub}2 Coatings as a Bactericidal and Osteointegrative Modification of Ti Implants
A common method for the improvement of bone growth on metallic implant surfaces is the coating with calcium phosphate (CaP). Hydroxyapatite (HA, Ca{sub}10(PO{sub}4){sub}6(OH){sub}2) is the most important inorganic component of natural bone and therefore the preferred material for coating-based surface modifications. HA is considered to be biocompatible and resorbable by osteoclasts, whose production is also supported by the mineral, and showed acceleration of bone growth in the initial stage after implantation as well as an improvement of the long-term fixation of the implant. The predominantly used method for commercial HA coating is the plasma spray technique, mainly because of its universal applicability for various coating materials. Nevertheless, this method has several drawbacks: the high process temperature leads to the formation of a compact layer showing only low similarity with natural bone apatite concerning porosity and crystallinity. Highly crystalline domains appear in partially amorphous surrounding area. Thus, in thick layers with different degradation kinetics for the crystalline and the amorphous phase the mechanical strength is reduced, which may lead to implant failure due to coating delamination in long-term applications.
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