Abstract
In this study, the change in sintering condition and the surface improvement by ion irradiation method was used to change the microstructure of hydroxyapatite (HA) to control the apatite formation on the HA surface, that is bioactivity of HA. Bioactivity of hydroxyapatite was investigated by soaking in simulated body fluid (SBF). The HA sintered at two different conditions showed similar apatite formation behavior after soaking in SBF. The HA irradiated with Ca ion at different ion dose and depth showed fibrous apatite formation on the surface at all ion irradiation condition. However, apatite formation rate was different. Apatite formation on the HA irradiated with Mg ion became lower with increasing Mg ion dose. Thus, the apatite formation of HA surface can be controlled by changing ion species, dose and depth. This means that the change in microstructure of HA can controll the bioactivity appropriate for use site.
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