Methods: 20 endodontically treated teeth were randomly divided into two groups (n=10); in one group Self-adhesive system without using etch and bond technique, and in the other group Separate acid etch adhesive system after etching (Phosphoric acid 32%) and bonding cements were applied into the root canal space. 12 mm of each cemented post within root canal sectioned in equal thirds using a 0.1 mm diamond disk. Each slice was polished with soft and wet abrasive paper to obtain 2 mm thickness. Loading was performed by a testing machine with a speed of 1 mm/min. until these posts were dislodged. The obtained data were statically analyzed using one sample Kolmogorov-Smirnov, T-test, and ANOVA test.
Results: Significant differences were found on all tooth regions. In separate acid etch adhesive group, the bond strength was stronger at coronal and middle regions. In self-adhesive system group, the bond strength was stronger at apical region. Bond strength was significantly increased from coronal to apical in self-adhesive system. In contrast, this bond strength rate reduced in coronal to apical in other group.
Conclusions: According to the increase of bond strength obtained in separate acid etch adhesive compared to self-adhesive, it seems convenient to use separate acid etch adhesive system for cementation of fiber reinforced post instead of self-adhesive system.