IADR Abstract Archives
Shear bond strength evaluation of experimental composite with silver nanoparticles coated with silicon dioxide for orthodontics.
Objectives: The purpose of this study was to investigate the shear bond strength of orthodontic brackets to bovine enamel using experimental composites with different concentrations of silver nanoparticles coated with silicon dioxide (Ag@SiO2)
Methods: Fifty bovine incisors were randomly divided into 5 groups according to the composite (n = 10): G1 - Commercial Control Group (Transbond XT Resin), G2 - Experimental Composite without Ag@SiO2 nanoparticles; G3 - Experimental composite with 0.5% of Ag@SiO2; G4 - Composite with 1% of Ag@SiO2; G5 - Composite with addition 3% of Ag@-SiO2. The shear bond strength (SBS) test was performed in a universal mechanical testing machine and the analysis of the adhesive remnant index (ARI) by optical microscopy. For analysis of SBS, Analysis of Variance (ANOVA) was used, followed by Tukey test, at 5% statistical significance level. The ARI results were analyzed descriptively.
Results: There was no statistically significant difference between the experimental groups (G2, G3, G4 and G5) and the commercial control (G1) (p> 0.05). However, it was observed that the incorporation of 3% of Ag@SiO2 reduced the values of Ru, and this difference was statistically significant when compared to group with 1% of Ag@SiO2 (p <0.05).
Conclusions: The incorporation of nanoparticles of Ag@SiO2 to composites did not negatively interfere in Ru of orthodontic brackets to bovine enamel when compared to commercial control. All the tested materials showed shear bond strength values suitable for clinical use.
Methods: Fifty bovine incisors were randomly divided into 5 groups according to the composite (n = 10): G1 - Commercial Control Group (Transbond XT Resin), G2 - Experimental Composite without Ag@SiO2 nanoparticles; G3 - Experimental composite with 0.5% of Ag@SiO2; G4 - Composite with 1% of Ag@SiO2; G5 - Composite with addition 3% of Ag@-SiO2. The shear bond strength (SBS) test was performed in a universal mechanical testing machine and the analysis of the adhesive remnant index (ARI) by optical microscopy. For analysis of SBS, Analysis of Variance (ANOVA) was used, followed by Tukey test, at 5% statistical significance level. The ARI results were analyzed descriptively.
Results: There was no statistically significant difference between the experimental groups (G2, G3, G4 and G5) and the commercial control (G1) (p> 0.05). However, it was observed that the incorporation of 3% of Ag@SiO2 reduced the values of Ru, and this difference was statistically significant when compared to group with 1% of Ag@SiO2 (p <0.05).
Conclusions: The incorporation of nanoparticles of Ag@SiO2 to composites did not negatively interfere in Ru of orthodontic brackets to bovine enamel when compared to commercial control. All the tested materials showed shear bond strength values suitable for clinical use.