Tensile strength of glass-fiber posts submitted to different surface treatments

Objective: in this study, it was evaluated, in vitro, the tensile strength of glass fiber posts submitted to different surface treatments. Methods: forty-eight maxillary canines had their crowns sectioned and radicular canals endodontically treated. The roots were embedded in acrylic resin and and distributed in 3 groups according to surface treatment applied to posts: Group I - the posts received silane agent for 30 seconds and adhesive; Group II - the posts were cleaned with alcohol and then received silane agent and adhesive; Group III - the posts were submitted to acid conditioning with 37% phosphoric acid for 30 seconds and then silane agent and adhesive. Each group was divided into 2 subgroups according to photopolymerization or not of adhesive, before insertion in the conduct: A - the adhesive was not photopolymerized and B - the adhesive was photopolymerized. All posts were cemented with Panavia F and the bodies-of-proof were submitted to the traction test in the Universal Machine Instron 4444 at a speed of 1 mm/min. Results: the ANOVA test showed significant difference between the groups (p<0.01). The Tukey test showed significant difference between GIII-B and the following groups: GI-A and GI-B (p<0.01). The other groups didn't present significant difference among them (p>0.05). Conclusion: It concluded that the substances used in this study to clean the posts interfere in its retention, with or without photopolymerization.