“…Since then, researchers have actively performed many studies on the applications of sodium titanate thin films in implants Nishiguchi et al, 1999;Jonášová et al, 2003;Muramatsu et al, 2003;Wang et al, 2007;Wang et al, 2008). Similar studies have also been performed on calcium titanate thin films (Hanawa et al, 1997;Hamada et al, 2002;Nakagawa et al, 2005;Kon et al, 2007;Ohtsu et al, 2008), titanium dioxide thin films (Ohtsuki et al, 1997;Wang et al, 2001;Wang et al, 2003;Byon et al, 2007), and a nanohydroxyapatite thin film (Xiong et al, 2010), and the excellent biocompatibilities of these films have been reported. Therefore, titanium compound thin films show tremendous promise for use as implant materials.…”