ABSTRACT
In order to improve the bond strength between fiber post and composite core, many surface treatment procedures have been performed on posts. The aim of this study was to investigate the effects of different surface treatments of a quartz fiber post [DT Light Post] on its bond strength with a composite core [Clearfil Photocore] after water storage and thermocycling. In this interventional, in-vitro study, fifty human canine teeth were endodontically treated and post spaces were prepared. A total of fifty fiber posts were divided into five groups according to the surface treatment preformed as control [no treatment], silanenized, sandblasted, sandblasted and silanized, etched with hydrofluoric acid and silanized. After cementation of posts with Panavia F2 in the canals, composite cores were built on them. Consequently, the core parts were cut and stored in deionized water at room temperature for three months. Then thermocycling in 3000 cycles was performed between 5°C and 55°C. Then two 1 mm-diameter slices were obtained from each core. Finally, bond strength was measured by the push out test. Data were analyzed with one-way ANOVA. Data of all five groups followed normal distribution, but there were no significant differences between them. The sandblasted and silanized group had the highest bond strength [11.3 +/- 4.6] and the control group had the lowest bond strength [9.6 +/- 3.7]. In this study, sandblasting, etching with hydrofluoric acid and silanization did not increase the bond strength between fiber post and composite core