Plasma-sprayed hydroxyapatite (HA) coating applied to metal substrates can induce a ndirect chemical bond with bone and hence achieve a biological fixation of the implant. However, the poor bonding strength between HA and substrate has been a concern for the orthopaedists. In our previous study, the zirconia reinforced HA composite coatings (HA/ZrO2) can improve the bonding strength of coatings to titanium, and the bonding degradation of HA/ZrO2 composite was evaluated by Chinese coin model. After 3 and 6 weeks, the new bone healing index (NBHI) and apposition index (AI) were analysed from back-scattered electron images (BEIs). Throughout all implant periods, the HA-coated implant, the evidence of direct bone-to-HAC was observed. However, the direct bone contact to HA/ZrO2 coatings was not found even 6 weeks after implantation. The different biocompatibility between HA coatings and HA/ZrO2 coatings should be induced by the minor changes of phase composition, crytallinity, and phase contents.
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