Purpose of the study: The aim of the study is to assess the influence of surface conditioning of fiberglass posts through etching and sandblasting, on retention to root canal. Material and method: 30 maxillary single root teeth were endodontic treated and were sectioned at 2 mm from enamel-dentine junction. After root canal instrumentation, fiberglass posts with same length were adhesively cemented. Tooth-post assembly mounted in a special conformer, was loaded by a universal testing machine, recording the force and displacement at which the post is dislocated first. Data has been statistically analyzed. Results: In the experimental group where posts were acid engraved samples yielded on greater forces (117.75 N) then group with sand blasted posts (101 N), but lower than the control group (129.36 N). Differences between the groups analyzed using ANOVA test, are not statistically significant. Conclusions: The displacements phenomenon at the interfaces dentin-adhesive-post is not significantly influenced by the type of treatment of the posts surface, compared to the control group.
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