“…The materials that have been used to produce GTR membranes are several: non-absorbable polymers, e.g. ePTFE (Wikesjo et al, 2003); absorbable polymers of synthetic origin, such as polylactic acid (PLA) (Park et al, 2000), poly (lactic-co-glycolic acid (PGLA) (Kurtis et al, 2002), polyglactin (Quinones et al, 1991) and biosynthetic cellulose (Galgut, 1990); or absorbable polymers of natural origin, such as collagen (Liao et al, 2005;Pitaru et al, 1989), cargile (Card et al, 1989) and chitosan (Ho et al, 2010;Mota et al, 2012). Besides those materials, composite membranes composed of PGLA with HA (Liao et al, 2005) or nano-apatite with poly(ε-caprolactone) (PCL) (Yang et al, 2009) have also been tested for this application.…”