Efeito de diferentes tratamentos de superfície em pinos de fibra de vidro fresados (CAD/CAM) na adesão ao canal radicular

Abstract

The objective of this research was to evaluate the effect of different surface treatments on milled fiberglass posts through the CAD/CAM system on their adhesion to the root canal. Forty-eight single-rooted permanent teeth were selected, with their crowns removed below the cement-enamel junction, and their roots were endodontically treated. Subsequently, the canals were prepared for the subsequent cementation of the fiberglass posts (FGP), which were produced from canal molds through the CAD/CAM system. The milled fiberglass posts were randomly divided into four groups (n = 12) according to the surface treatment of the posts: no treatment (control), 70% alcohol, 35% hydrogen peroxide, and aluminum oxide (Al2O3) blasting. Subsequently, a bonding agent, silane (Monobond N, Ivoclar Vivadent), was applied to all groups. In each group, 2 randomly selected milled PFVs were qualitatively evaluated through scanning electron microscopy (SEM). In all groups, the milled posts were cemented with self-adhesive resin cement (RelyX U200, 3M ESPE), and six specimens (slices) were obtained from each root, which were tested for push-out bond strength. The obtained data was subjected to two-way ANOVA and Tukey's post-test (α = 0.05). It could be observed that the 70% alcohol treated group obtained statisticaly superior BS results over the other groups, the hydrogen peroxide and sandblasting groups with average results and the isolated silane aplication was statisticaly below average. It could be concluded that the 70% alcohol aplication followed by surface FGP milled silanization is the best option to increase the adhesion on the root canal dentin.