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Static water contact angle on titanium surface. A. Negative control (resorbable blasted media surface titanium). B. Collagen-coated surface. C. Collagen/BMP-2-coated surface. D. Collagen/nHAp/BMP-2-coated surface. (BMP-2: bone morphogenetic protein-2, nHAp: nano-hydroxyapatite)
