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Visualization by confocal laser scanning microscopy of DAPI stained three-species biofilm of Streptococcus oralis, Streptococcus gordonii, and Actinomyces naeslundii cultured anaerobically. Biofilm attachment after one day on: (a) 10% ZnO-NP and (b) unmodified composite, (c) magnified view of biofilm on unmodified composite (2400× magnification).
