Ions of silver (Ag+) are toxic to microorganisms, while metallic silver is inert in the presence of human tissues. Colloidal silver has been reported to show strong bactericidal activity on single species bacteria in suspension. Bacteria in biofilms have much higher resistance against antimicrobial agents than those in planktonic form, which makes infections more difficult to control.
An in vitro study on antimicrobial effect of metallicAn in vitro study on antimicrobial effect of metallicsilver colloidal against multispecies oral biofilm
Yan Hea, Zhihao Lib, Zyta Ziorac, Hans Larood, Laurence Walsha