Background: The purpose of the study is to assess the antiadherent and antibacterial properties of surfacemodified 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.

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Purpose: Discouraging microbial adhesion to dental prosthetics is an effective means of preventing secondary caries and opportunistic infections. We developed prototype resins containing surface reaction-type pre-reacted glass-ionomer (S-PRG) filler for use in facing crowns with the objective of inhibiting microbial adhesion to facing crowns and plaque formation. Methods: In this study, in vivo tests of the antiplaque effect of these resins and in vitro tests of their effect in preventing the adhesion of Streptococcus mutans and Candida albicans were carried out, and the flexural strength, Vickers hardness, and toothbrush wear were also investigated. Results:The flexural strength and Vickers hardness of all the test materials met the ISO criteria. In toothbrush wear tests, increasing the S-PRG filler content made no great difference to the amount of wear. In the antiplaque tests, plaque adhesion was more suppressed as the S-PRG filler content increased. In the microbial adhesion test, increasing the S-PRG filler content made no great difference when the test materials were immersed in distilled water. However, the Streptococcus mutans and Candida albicans counts both decreased when the test materials were immersed in saliva or subjected to thermal cycling. Conclusions: Materials with an S-PRG filler content of 9.4-18.8 wt% had antiplaque properties and excellent physical properties. These results also suggest that they may exert long-lasting antimicrobial adhesion properties.