主催: The Japanese Society for Dental Materials and Devices
Titanium and its alloys have good biocompatibility with body cells and tissues and are widely used for implant applications, However, clinical procedures place more stringent and tough requirements on the titanium surface modification treatments. Among the many methods of titanium surface modification, electrochemical techniques are simple and cheap. Anodic oxidation is the anodic electrochemical technique while electrophoretic and cathodic depositions are the cathodic electrochemical techniques. By anodic oxidation it it possible to obtain desired roughness, porosity and chemical composition of the oxide. The chief advantage of this technique is doping of the coating of the elctrolyte constituents and incorporation of these elements improves the properties of the oxide. Electrophoretic deposition used HA powders dispersed in a suitable solvent at a particular pH. Under these operatng conditions these particles acquire positive charge and coatings are obtained on the cathodic titanium by applying an external electric field. These coatings require a post sintering treatment to improve the coating properties. Cathodic deposition is another type of electrochemical method where HA is formed in situ from an electrolyte containing calcium and phosphate ions. It is also possible to alter structure and/or chemistry of the obtained deposit. Nano-grained HA has higher surface energy and greater biological activity and therefore emphasis is being produce these coatings by cathodic deposition.
