Background: Dental cobalt base alloys are biocompatible dental materials and have been widely\r\nused in dentistry. However, metals are bioinert and may not present bioactivity in human body.\r\nBioactivity is the especial ability to interact with human body and make a bonding to soft and hard\r\ntissues. The aim of the present research was fabrication and bioactivity evaluation of novel cobalt alloy/\r\nFluorapatite nanocomposite (CoA/FaNC) with different amounts of Fluorapatite (FA) nanopowder.\r\nMaterials and Methods: Co-Cr-Mo alloy (ASTM F75) powder was prepared and mixed in a\r\nplanetary ball mill with different amounts of FA nanopowders (10, 15, 20% wt). Prepared composite\r\npowders were cold pressed and sintered at 1100�°C for 4 h. X-ray diffraction (XRD), scanning\r\nelectron microscopy and transition electron microscopy techniques were used for phase analysis,\r\ncrystallite size determination of FA and also for phase analysis and evaluation of particle distribution\r\nof composites. Bioactivity behavior of prepared nanocomposites was evaluated in simulated body\r\nfluid (SBF) for 1 up to 28 days.\r\nResults: Results showed that nucleus of apatite were formed on the surface of the prepared CoA/\r\nFaNC during 1 up to 28 days immersion in the SBF solution. On the other hand, CoA/FaNC unlike\r\nCo-base alloy possessed bone-like apatite-formation ability.\r\nConclusion: It was concluded that bioinert Co-Cr-Mo alloy could be successfully converted into\r\nbioactive nanocomposite by adding 10, 15, 20 wt% of FA nano particles.
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