Authors have investigated the association of antimicrobial agents and composites for orthodontic bonding to reduce the appearance of demineralization areas in the enamel. Silver particles show efficacy and broad spectrum of action, however their addition may compromise the optical properties of the material. In this context, silver nanoparticles coated with silicon dioxide (Ag_SiO2) are being evaluated to minimize color change. The purpose of the study is to evaluate the shear bond strength of experimental composites with different concentrations of Ag_SiO2. Fifty bovine incisors will be used, which will be randomly divided into 5 groups according to the composite (n = 10): G1 - Control group (Transbond XT Composite), G2 - Experimental composite with out the addition of Ag_SiO2; G3 - Experimental composite with 0.5% Ag_SiO2; G4 - Composition with addition of 1% of Ag_SiO2; G5 - Composition with addition of 3% of Ag_SiO2. The shear Bond strength test will be performed using a universal machine of mechanical tests. Data will be tabulated and analyzed for normal distribution and homogeneity. In case of parametric distribution, Variance Test will be use data 5% probability level. If there is any difference be tween the groups, Tukey's test will be performed (p <0.05).
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