Abstract
MicroRaman measurements have been performed on a commercially available plasma sprayed hydroxyapatite-coated titanium implant. A double-band structure in the ν 1 vibration mode was clearly identified and attributed to the presence of β-tricalcium phosphate at the metal substrate–hydroxyapatite interface. β-tricalcium phosphate probably results from the specific crystallization mode of the molten hydroxyapatite particles due to rapid cooling during the plasma spray process. The presence of β-tricalcium phosphate can explain the dissolution of the hydroxyapatite coating when exposed to the body fluid for a long period of time due to the high solubility of β-tricalcium phosphate in acidic medium.
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