Evaluation of the Influence of Resin Cement Thickness on the bond Strength of FRC Post

Statement of Problem: The increasing popularity and widespread use of fiber posts have changed the procedure of reconstructing endodontically treated teeth. A reinforced composite (FRC) posts presents the advantage of having an elasticity modulus similar to the dentin, which reduces the risk of root fracture. Some factors like cement thickness may affect the bond strength of the posts. This study aimed to evaluate the influence of resin cement thickness on the bond strength of a FRC post system. In this experimental study, eighteen singles-rooted human teeth were decoronated. (Length: 16 mm) the The canals were prepared, and the specimens were randomly allocated to two groups (n=9): Group 1, (low cement thickness) in which size 3 FRC posts and group 2 (high cement thickness) in which size 1 FRC posts were cemented. Specimens The specimens were sectioned, producing 2 samples (thickness: 4.5mm). For evaluation of the cement thickness evaluation, an optical microscope was used. Each sample was evaluated using push-out test and the data were statistically analyzed.The exiting data were analyzed with using T-test. Bond strengths of the 2 groups, low cement thickness and hight cement thickness, did not show a significantly different (p = 0.14). The increase in cement thickness surrounding the FRC post did not impair the bond strength.