In Vitro Evaluation of Various Surface Treatments of Fiber Posts on the Bond Strength to Composite Core

The reliable bond at the root-post-core interface is critical for the clinical success of post-retained restorations. To decrease the risk of fracture، it is important to optimize the adhesion. Therefore، various post surface treatments have been proposed. The purpose of this study was to investigate the influence of various surface treatments of fiber posts on the bond strength to composite core. In this study، 40 fiber reinforced posts were used. After preparing and sectioning them، resulting specimens were divided into four groups (N=28). The posts received different surface treatments such as no surface treatment (control group)، preparing with hydrogen peroxide 10%، preparing with silane، preparing with HF and silane). Then، posts were tested in micro tensile testing machine. The results were analyzed by One-Way ANOVA and Dunnett T3 test. The greatest bond strength observed was in treatment with hydrogen peroxide 10% (19. 84±8. 95 MPa)، and the lowest strength was related to the control group (12. 44±3. 40 MPa). The comparison of the groups with Dunnett T3 test showed that the differences between the groups was statistically significant (α=0. 05). Based on the results of this study، preparing with H2O2 -10 % and silane increases the bond strength of FRC posts to the composite core more than the other methods. Generally، the bond strength of posts to the composite core increases by surface treatment.