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Almaroof A, Niazi SA et alDent Mater 2016; 32: 929–939

A range of antibacterial agents such as chlorhexidine, fluoride and metallic agents have been incorporated in resin composites; alas their antibacterial effects are short-term, and the mechanical and the aesthetic properties of the composite are compromised. The aim of this in vitro study was to examine the antibacterial properties of an experimental composite containing eugenyl methacrylate monomer. No inhibition zones (agar diffusion test) were detected against Enterococcus faecalis, Streptococcus mutans and Propionibacterium acnes. Not unexpectedly, however, the composite containing the covalently anchored monomer did demonstrate surface antibacterial activity. In addition, the modified composite demonstrated an increase in hydrophobicity.