[ in-vitro comparison between antimicrobial activity of nanosilver and chlorhexidine against streptococus sanguis and actinomyces viscosus]

ABSTRACT

The antimicrobial activity of silver nanoparticles has been investigated in medical fields in recent years, but its effect on dental plaque micro-organisms has not been studied. The aim of the present study was to evaluate the in vitro antimicrobial properties of nanosilver on two dental plaque microorganisms and to compare it with chlorhexidine. In this experimental study, antibacterial effects of silver nanoparticles and chlorhexidine against Streptococus sanguis and Actinomyces viscosus were determined by minimum inhibitory concentration [MIC] and minimum bactericidal concentration [MBC] using microdilution method. Each experiment was repeated at least five times to ensure the accuracy of testing. Results showed that the MIC of soluble silver nanoparticles and chlorhexidine for Streptococcus sanguis were 16 and 256 microg/ml, respectively. Soluble silver nanoparticles had an MIC of 4 and chlorhexidine had an MIC of 64 micro g/ml for Actinomyces viscosus. The MBC of soluble silver nanoparticles and chlorhexidine for Streptococcus sanguis were 64 and 512 microg/ml, respectively and for Actinomyces viscosus these figures were 16 and 102 microg/ml, respectively. Silver nanoparticles have strong antibacterial activity against Streptococus sanguis and Actinomyces viscosus which was achieved by lower doses in comparison to chlorhexidine mouthwash