The effect of surface treatments on the bond strength of fiber post to root canal dentin

Abstract

It’s known that many factors such as root canal dentin or post surface treatment may effect the retention of post. The purpose of this in vitro study was to evaluate the effect of different surface treatments on the bond strength of fiber post with luting agent to root canal dentin. 75 extracted single root teeth were used in this study. The canals were prepared with rotary instruments and obturated by AH Plus and lateral condensation technique. After post space preparation, 75 fiber-posts (Rebilda, Voco) were divided into 5 groups and treated with one of the following surface treatment procedures: no treatment (control), silanization, etching by % 9.6 hydrofluoric acid, sand blasting with 50 milimicron Al2O3 and bonded (15 of each). After that, posts were bonded with dual polimerizing resin based luting material. The specimens were embedded in acrilic resin blocks and sliced from the apical, middle, coronal part of the roots. A push out bond strength test was performed by a universal testing machine at across head speed of 1mm/min. Data were analyzed with one-way Anova and Tukey tests. Although silanization showed the least and sanding the best bond strength, only statistical difference was found between silanization and etching (p<0.05) and between sanding and bonding (p<0.05). Bonding group showed the highest bond strength in coronal section, and sandblasted group in middle and apical section (p<0.05). The different surface treatment affected the bond strenght of fiber post to root canal dentin.