The effect of sodium hypochlorite and resin cement systems on push-out bond strength of cemented fiber posts

Objective: this study investigated the effect of different endodontic irrigant solutions and resin cement systems on the bond strength of cemented fiber posts. methods: sixty human single-rooted anterior teeth were sectioned transversely at 2 mm incisal to the cemento-enamel junction (cej). the roots were treated endodontically,and teeth were distributed into six groups: group a,includes 5.25%naocl irrigant with multicore flow core build-up material; group b,includes 5.25%naocl irrigant with relyx-unicem self-adhesive universal resin cement; group c,includes 2.5% naocl irrigant with multicore flow; group d,includes 2.5%naocl irrigant with relyx-unicem; group e,includes nacl,irrigant with multicore flow; and group f,includes nacl irrigant with relyx-unicem. universal tapered fiber posts (no. 3 relyx fiber post) were cemented,and roots were sectioned into cervical and apical segments. samples were then subjected to a push-out bond strength test and failure modes were examined. results: the mean push-out bond strength for group d showed the highest mean value (20.07 mpa),while the lowest value was found in group a. there was a significant difference between groups with regard to the irrigants used (p<0.001),however,no significant difference was found between groups with regard to resin systems (p>0.05). the total mean push-out bond strength of the cervical segments was found to be significantly higher than the apical segments (p<0.001). conclusion: the irrigant solution have a clear influence on the push-out bond strength of the fiber posts regardless of the cement used. both adhesive resin systems showed similar bonding strength. © 2016,pakistan journal of medical sciences. all rights reserved.