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Background  . Incorporation of antifungal and antimicrobial agents into tissue conditioners might inhibit the formation of microbial plaque and prevent complications such as denture stomatitis. The present study was carried out to evaluate the antibacterial and antifungal properties of a tissue conditioner after incorporation of ZnO‒Ag nanoparticles into their structure.  Methods  . In this in vitro study, 4 microorganisms were evaluated at 6 concentrations of ZnO‒Ag nanoparticles at 24- and 48-hour intervals, using 168 samples. The nanoparticles were mixed at a ratio of 50% Ag and 50% ZnO and were homogenized with the tissue conditioner at 0.625, 1.25, 2.5, 5, 10 and 20 wt% according to the MIC technique principles. After culturing the microorganisms, a spectrophotometer was used for determining proliferation of microorganisms with the use of turbidity after 24 and 48 hours of incubation at 37ºC.  Results  . Complete inhibition of the proliferation of Candida albicans, Enterococcus faecalis and Pseudomonas aeruginosa was observed at 24- and 48-hour intervals at a concentration of 10%; such inhibition was observed at 20% concentration of nanoparticles with Streptococcus mutans . In addition, the most effective concentration of ZnO‒Ag nanoparticles at both 24- and 48-hour intervals was 5% with C. albicans and 2.5% with E. faecalis . In addition, the most effective concentration at 24- hour interval with S. mutans was 10% and with P. aeruginosa they were 5% at 24-hour and 2.5% at 48-hour intervals.  Conclusion  . Incorporation of ZnO‒Ag nanoparticles into tissue conditioners resulted in the inhibition of bacterial proliferation.

Evaluation of antibacterial and antifungal properties of a tissue conditioner used in complete dentures after incorporation of ZnO‒Ag nanoparticles