Abstract Objectives: The aim of this study was to evaluate the bond strength of fiber posts to root canal dentin after irrigation of post spaces prepared immediately after root canal filling. Materials and Method: Thirty roots of maxillary central incisors and canines were divided into 3 groups (n=10) and irrigated with different solutions. In the first group which served as the control, only distilled water was used for irrigation. In the second group, 5.25% NaOCl, 17% EDTA and distilled water were used subsequently for irrigation. In the third group, 5.25% NaOCl, 17% EDTA and distilled water were used. Then, 10% sodium ascorbate was applied to root canals for 10 minutes. RelyX Fiber Posts were cemented with RelyX Unicem self-adhesive resin cement. Three slices from different root regions (coronal, middle, apical) were sectioned, and totally 90 slices were collected. The push-out test was conducted and the SEM analysis was performed to determine the failure modes. One-way Anova and Tukey HDS tests were used to analyze the data (p<0.05). Results: The bonding strength was found as 8,64„b3,73 MPa in the control group (Group 1), 8,37„b2,88 MPa in Group 2, and 9,94„b2,94 MPa in group 3. There were no statistically significant differences between the bonding strength values of the groups related to irrigation procedures. In addition, there were no statistically significant differences between the bonding strength values to different regions of the roots. Conclusion: It can be concluded that sodium ascorbate application after post space preparation did not cause significantly higher bonding strength of fiber posts to dentin, compared to conventional NaOCl and EDTA irrigation.
Keywords: Sodium ascorbate, bond strength, fiber post.