Aim: The aim of this study was to investigate the fracture strength of three post systems cemented with a dual cure composite resin luting cement by using different adhesive systems.

Methods and Materials: In this study 63 extracted anterior teeth with single roots were endodontically prepared and filled. Teeth were randomly assigned to one of three post systems placed into the prepared canals: Group I-titanium posts (n= 21)(Filpost); Group II-glass fiber posts (n= 21)(Mirafit White); and Group III zirconia posts (n= 21)(CosmoPost). Each group was again randomly divided into three subgroups according to the bonding materials used [Single Bond (n= 7), Clearfil SE Bond (n= 7), and Prompt L Pop (n= 7)]. A dual cured resin cement (Rely X ARC) was used for bonding the posts into the root canals. Standard cores were made by a composite resin (Clearfil Photocore) using core build-ups. The samples were tested in the compression test machine for 1 mm/min and fracture resistance of the teeth were recorded. The data was analyzed by using twoway analysis of variance (ANOVA) and Duncan’s New Multiple Range Tests. A significance level of p<. 05 was used for all comparisons.

Results: There was a significant difference in fracture resistance between the post systems (p< 0.05) and the interaction of adhesive resins and post systems (p< 0.05). Mirafit White was more resistant to fracture than other groups; Filpost showed the least resistance to fracture. CosmoPost post system bonded with Single Bond recorded the lowest fracture resistance (p< 0.05).