nanocomposite biocompatible hydrogels may be synthesised as model systems for in situ cured local drug delivery devices for treatment of inter alia periodontal infections . the composite includes the following components : nanoparticles , a matrix gel , and chlorhexidine or other antibacterial drug . the nps were obtained by free radical initiated copolymerization of the monomers , 2 - hydroxyethyl methacrylate and polyethyleneglycol dimethacrylate , in aqueous solution . the same monomers were used to prepare crosslinked matrices by photopolymerization . nchgs were obtained by mixing nps , monomers , and drug in an aqueous solution then crosslinked by photopolymerization .