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Photocatalysis induced by TiO 2  and UV light constitutes a decontamination and antibacterial strategy utilized in many applications including self-cleaning environmental surfaces, water and air treatment. The present work reveals that antibacterial effects induced by photocatalysis can be maintained even after the cessation of UV irradiation. We show that resin-based composites containing 20% TiO 2  nanoparticles continue to provide a pronounced antibacterial effect against the pathogens  Escherichia coli ,  Staphylococcus epidermidis ,  Streptococcus pyogenes ,  Streptococcus mutans and Enterococcus faecalis  for up to two hours post UV. For biomaterials or implant coatings, where direct UV illumination is not feasible, a prolonged antibacterial effect after the cessation of the illumination would offer new unexplored treatment possibilities.

Photocatalytic Antibacterial Effects Are Maintained on Resin-Based TiO2 Nanocomposites after Cessation of UV Irradiation