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In vitro release curve of bone morphogenetic protein-2 (BMP-2) from various surface-treated titanium disks. The results are shown as mean±standard deviation values (n=3). An increase in BMP-2 release was observed within 24 hours. A sustained release in the Col/nHAp/BMP-2 group was observed between 1-5 days. (Col: collagen, nHAp: nano-hydroxyapatite)
