A self-adhesive resin cement can provide a significantly stronger bond than a three-step etch-and-rinse adhesive and resin cement when used to lute fiber posts. SUMMARYThe bond strength of fiber posts luted with resin cements was evaluated after two storage times in different regions of a post space. A total of 40 single-rooted human teeth were endodontically treated and prepared for cementation of fiber posts (White Post DC). In groups 1 and 3 (G1 and G3, respectively), posts were luted with RelyX ARC, whereas the posts in groups 2 and 4 (G2 and G4, respectively) were luted with RelyX Unicem. After one month of storage at 100% humidity, G1 and G2 were transversally sectioned in 1.7-mm slices of the cervical (C), middle (M), and apical (A) thirds of the post space and submitted to push-out testing at 1 mm/min. After nine months of storage, the roots of G3 and G4 underwent the same process. Mean values were analyzed using the Mann-Whitney and Kruskal-Wallis tests (a¼0.05). The bond strengths in G2 (C¼4.2662.29; M¼4.6763.54; A¼7.2764.30) were statistically higher than in G1 (C¼3.8161.07; M¼1.5761.62; A¼1.9961.60) in the middle and apical thirds (p¼0.001). Bond strengths in G4 (C¼3.3661.39; M¼4.4962.17; A¼3 . 8 361 . 9 2 ) w e r e h i g h e r t h a n i n G 3 (C¼2.1360.47; M¼0.9461.05; A¼0.9561.02) in all evaluated regions ( p¼0.02, p,0.001, and p,0.001, respectively). When comparing the root regions for each group, G1 had higher , 2011, 36-6, 643-648 values in the cervical third than the middle third (p¼0.02). The self-adhesive resin cement showed better results than the conventional resin cement at both storage times. For both materials a similar performance among the three root regions was found. Storage time did not influence the shear bond strength.