Influence of Calcium Silicate-Based vs. Resin-Based Sealers on Pull-Out Bond Strength of Two Universal Adhesive/Resin Cement Combinations for Fiber Posts Cementation

This in vitro study investigated the influence of root canal sealer type (calcium silicate-based vs. resin-based) on the pull-out bond strength of two universal adhesive/resin cement combinations. Forty-eight human premolars were prepared, obturated with either Ceraseal™ (calcium-silicate based) (C) or AH Plus™ (resin-based) (A), and stored at 37°C, 100% humidity for 24 hours. Two adhesive/resin cement combinations were used for fiber post cementation: Single Bond Universal/RelyX™ Ultimate (UT) and ScotchbondTM Universal Plus/RelyX™ Universal (UN). Pull-out bond strength values (Newton) were measured after seven days using a universal testing machine. Then all fiber posts were observed for mode of failure using a stereomicroscope. AH PlusTM and ScotchbondTM Universal Plus/RelyXTM Universal (AUN) had the highest bond strength (263.50 ± 46.47 N), while CeraSealTM and Single Bond Universal Adhesive/RelyXTM Ultimate (CUT) had the lowest (202.88± 38.21 N). The results of the two-way ANOVA indicated a significant main effect for root canal sealer types (P = 0.025); a significant main effect for resin cement types (P = 0.015); and no significant interaction effect between root canal sealer types and resin cement types (P = 0.068). Post hoc Tukey HSD testing revealed significant differences between CUT and CUN (p = 0.008), CUT and AUN (P = 0.003), and CUT and AUT (P = 0.024). The most common failure mode was the mixed type. The type of root canal sealer and the combination of adhesive/resin cements influence pull-out bond strength values. Using the calcium-silicated base sealer may decrease the pull-out bond strength values in certain adhesive/resin cement combinations.