Background: To evaluate the antibacterial property of a modified orthodontic resin with different concentrations of silver-nanoparticles (AgNPs), and quantify its preventive effect on the formation of white spot lesions (WSLs).
Material And Methods: An orthodontic resin (Transbond XT) was modified with four concentrations of AgNPs (1%, 0.5%, 0.1%, and 0.05%), the orthodontic resin without AgNPs was used as control. Polymerized resin discs (n=80) were submitted to Agar diffusion test on Petri dishes inoculated with and . In addition, resin discs of each group (n=40) were placed in 96-well plates with bacterial suspensions to evaluate the colony-forming-units (CFU). For the WSLs prevention test, brackets were bonded with the experimental orthodontic resins on 45 premolars (n=5), and were subjected to a microbiological caries induction method for 9 days. Photographs were taken before and after the test, and the images were evaluated with the Image J software to calculate the area of WSLs. The data were analyzed using ANOVA and Tukey-HSD test, Student´s t-test and Kruskal-Wallis test (α=0.05).
Results: The 0.5% and 1% AgNPs modified resin inhibit the growth of and . All the modified resins showed significantly less CFU, when compared to the control (<0.05). 1% AgNPs resin promote the higher prevention of WSLs formation. There was no significant difference between the control group and the 0.1% and 0.05% groups.
Conclusions: 0.5% and 1% of AgNPs modified orthodontic resin exhibit an important antibacterial activity against and , and prevent the formation of WSLs. White spot lesions, antibacterial, orthodontics, adhesive, Silver-nanoparticles.
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| http://dx.doi.org/10.4317/jced.58330 | DOI Listing |
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