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Recently, nanoparticles such as nano-TiO 2  have been added to some dental materials for enhancing dental carries prevention due to their antibacterial activity.Aim:  This study aimed to assess the shear bond strength of a self-adhesive composite containing TiO 2  and SiO 2  nanoparticles for orthodontic bracket bonding.Materials and methods:  This in vitro, experimental study was done on 70 extracted human premolars divided into 7 groups. Six groups of Vertise Flow self-adhesive composite samples were prepared: without any nanoparticles, with 0.5% and 1% TiO 2  nanoparticles, 0.5% and 1% SiO 2  nanoparticles, and 1% mixture of TiO 2  and SiO 2  nanoparticles so that nano-hybrid composites were prepared. Metal brackets were bonded with these samples as well as Transbond XT as the control group. The shear bond strength of the brackets to enamel was measured using a universal testing machine. The adhesive remnant index (ARI) score was also determined by a stereomicroscope. Data were analyzed by one-way ANOVA, Tukey’s test and Kruskal-Wallis test.Results:  The shear bond strength of the groups was significantly different ( p =0.000). Pairwise comparisons revealed that the bond strength of Transbond XT group was significantly higher than others ( p &lt;0.05), followed by the 1% TiO 2  group with significant differences with Vertise Flow and 0.5% TiO 2  groups. The lowest value belonged to Vertise Flow with no nanoparticles. The ARI scores was different in the control group ( p =0.000).Conclusions:  Adding TiO 2  and SiO 2  nanoparticles to Vertise Flow self-adhesive composite not only did not adversely affect its shear bond strength, but also slightly increased it. Overall, the self-adhesive nano-hybrid composite containing TiO 2  and/or SiO 2  nanoparticles, following an additional etching step would be acceptable for bracket bonding and can be used clinically to benefit from the antimicrobial activity of these nanoparticles.

folia medica

Shear Bond Strength of Self-Adhesive Composite Containing TiO 2  and SiO 2  Nanoparticles with an Additional Etching Step for Orthodontic Brackets Bonding to Enamel