Push-out bond strength of fiber posts to root dentin using glass ionomer and resin modified glass ionomer cements

Objective: the purpose of this study was to assess the push-out bond strength of glass fiber posts to root dentin after cementation with glass ionomer (glcs) and resin-modified glass ionomer cements (rmgics). material and methods: fifty human maxillary canines were transversally sectioned at 15 mm from the apex. canals were prepared with a step back technique until the application of a #55 k-file and filled. post spaces were prepared and specimens were divided into five groups according to the cement used for post cementation: luting & lining cement; fuji ii lc improved; relyx luting; ketac cem; and ionoseal. after cementation of the glass fiber posts,all roots were stored at 100% humidity until testing. for push-out test,1-mm thick slices were produced. the push-out test was performed in a universal testing machine at a crosshead speed of 0.5 mm/min and the values (mpa) were analyzed by kolmogorov-smirnov and levene's tests and by two-way anova and tukey's post hoc test at a significance level of 5%. results: fiber posts cemented using luting & lining cement,fuji ii lc improved,and ketac cem presented the highest bond strength to root dentin,followed by relyx luting. ionoseal presented the lowest bond strength values (p>0.05). the post level did not influence the bond strength of fiber posts to root dentin (p=0.148). the major cause of failure was cohesive at the cement for all gics and rmgics. conclusions: except for ionoseal,all cements provided satisfactory bond strength values. © 2014,faculdade de odontologia de bauru. all rights reserved.