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Background  The purpose of the study is to assess the antiadherent and antibacterial properties of surface-modified different orthodontic brackets with silver nanoparticles against  Streptococcus mutans  and  Streptococcus sobrinus , using radiomarker.    Methods  In this study evaluated quantitatively the adherence of  Streptococci  to orthodontic brackets, 300 samples of orthodontic brackets were selected and classified in to 10 groups as follow: GIn (InVu-Roth), GIIn (System-AlexanderLTS), GIIIn (Gemini-Roth), GIVn (NuEdge-Roth), GVn (Radiance plus-Roth), GVI (InVu-Roth), GVII (System-AlexanderLTS), GVIII (Gemini-Roth), GIX (NuEdge-Roth), GX (Radiance plus-Roth). All the samples were sonicated and  Streptococci  were cultivated by gender. A radioactive marker ( 3 H) was used to codify the bacteria and measure them. After that, the brackets were submerged in a radiolabelled solution, and the radiation was measured. The statistical analysis was calculated with ANOVA test (Sheffè post hoc).    Results  The results showed significant differences were found among the groups. GIIIn shown the lowest scores for both bacteria; in contrast, GIX for  Streptococcus mutans  and GVI for  Streptococcus sobrinus  were the highest values.    Conclusions  Surface modification of orthodontic brackets with silver nanoparticles can be used to prevent the accumulation of dental plaque and the development of dental caries during orthodontic treatment.

Silver nanoparticles in orthodontics, a new alternative in bacterial inhibition: in vitro study