Effect of a root dentin deproteinization protocol on self-adhesive cementation of fiber posts

Aim: This study evaluated the effect of a root dentin deproteinization protocol on the bond strength of fiber post cemented with self-adhesive resin cement. Materials and Methods: Twenty-four single-rooted teeth were randomly divided into two groups (n=12), as follows: G1 - cementation with self-adhesive resin cement RelyX U200 (3M/ESPE) according to manufacturer's instructions; G2 - treatment of root dentin with phosphoric acid at 37% for 15 s followed by sodium hypochlorite (NaOCl) at 5% for 5 minutes, and post cementation according to manufacturer's instructions. A light-emitting diode (LED) unit was used for photoactivation and after 24h at 37 °C in absolute humidity, teeth were sectioned into slices of 1 mm divided by different root thirds (cervical, middle and apical) and submitted to the push-out bond strength test. Two-criteria ANOVA was used to determine the statistical significance between groups (p<0.05). Results: No statistical difference in bond strength between group cemented as manufacturer's instructions and group submitted to deproteinization was detected (p>0.05). As well as there was no statistical difference between the different root thirds evaluated (p>0.05). Conclusions: The deproteinization protocol proposed was not able to improve the bond strength of self-adhesive cement to root dentin.