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International Journal of Dentistry
Volume 2016, Article ID 9319534, 7 pages
Research Article

Influence of the Cement Film Thickness on the Push-Out Bond Strength of Glass Fiber Posts Cemented in Human Root Canals

1Department of Dentistry, Rio de Janeiro School of Dentistry, State University of Rio de Janeiro, 222600-000 Rio de Janeiro, RJ, Brazil
2Department of Materials Engineering, Pontifical Catholic University of Rio de Janeiro, 22451-045 Rio de Janeiro, RJ, Brazil

Received 16 December 2015; Revised 1 March 2016; Accepted 24 March 2016

Academic Editor: Patricia Pereira

Copyright © 2016 Natália Araújo Silva Prado et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The present study evaluated the influence of the cement film thickness on the push-out bond strength of glass fiber posts in the cervical, medium, and apical thirds of root canal spaces. Thirty roots were randomly divided into three groups, according to the fiber post system’s drills: (G1) #2; (G2) #3; (G3) #4. The posts were cemented using a self-adhesive cement, and a small amount of powdered Rhodamine B was used as a stain. Images of both sides of each slice were obtained before and after the push-out test. To determine the cement thickness, a macro routine was developed using the software KS 400. The data were analyzed statistically using Kruskal-Wallis and Dunn’s test. G2 ( MPa) showed statistically higher bond strength values than G1 ( MPa) and G3 ( MPa). All groups presented higher bond strength values in the apical third. The bur diameter significantly influenced the results of the shear bond strength for the push-out test. The slight increase in the cement thickness allowed an increase in the values of shear bond strength when compared to very thin or very thick cement films.