Comparison of bond strength of three different self-adhesive resin cement to post and root dentin

Objective: the aim of this in vitro study was to evaluate the bond strength of three different self-adhesive resin cements on the post and dentin surface using push out test. material-method: in the present study, 15 extracted human maxillary incisor teeth with single canal and roots were used. the clinical crowns were removed to obtain a root canal length of 15 mm and then root canals were prepared with reciproc r25 (vdw gmbh, munich, germany) files. the smear layer was removed using 3 ml 17% edta followed by 3 ml 5.25% naocl and 5ml distilled water before root canal obturation. then all the root canals were obturated with lateral compaction technique using epoxy resin based sealer and gutta-percha. after the preparation of the post space, the roots were randomly divided into three groups according to the resin cements used. fiber posts were cemented, using one of these three different resin cements: bifix se (voco gmbh,cuxhaven, germany), breeze (pentron,wallingford,usa) and relyx u 200 (3m espe,neuss,germany). the roots were sliced to 1mm-thick horizontal sections from the coronal and middle thirds (n: 5 root 4 slice = 20 specimen), and the push-out bond strength test was applied. the data were calculated as mpa and statistically analyzed using one-way anova and post-hoc tukey test. results: there was no statistically significant difference between the bifix se, and the breeze. however, there was a statistically significant difference between relyx u 200 and the other resin cements. the bond strength of relyx u 200 was better than breeze and bifix se. discussion: the toughest of the three tested resin cements was relyx u 200 with regard to push out bond strength. there was no difference between the bond strengths of bifix se and breeze.