Bone like apatite formation on modified Ti surfaces with COOH, NH2, and OH functional groups by plasma polymerization

Hydroxyapatite (Ca10(PO4)6(OH)2, HA) is materials mainly known for its special ability to contact bone tissue. In this study, bone like apatite formation was investigated at the titanium (Ti) surface with functional groups, –COOH, –NH2, and –OH respectively. Ti surface was modified by depositing a thin polymeric film containing COOH, NH2, and OH groups through plasma polymerization of acrylic acid, ally amine and allyl alcohol. Plasma polymerization carried out at a discharge power of 50 W for 5 min. Modified Ti samples were evaluated by immersed in simulated body fluid at 36.5 °C for 4 days and 7 days. COOH/Ti was favorable for bone-like apatite formation when compared with untreated Ti, NH2/Ti and OH/Ti.