title: Influence of the Cement Film Thickness on the Push-Out Bond Strength of Glass Fiber Posts Cemented in Human Root Canals.
abstract: 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 (14.62 ± 5.15 MPa) showed statistically higher bond strength values than G1 (10.04 ± 5.13 MPa) and G3 (7.68 ± 6.14 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.
authors.affiliation: Department of Dentistry, Rio de Janeiro School of Dentistry, State University of Rio de Janeiro, 222600-000 Rio de Janeiro, RJ, Brazil.
authors.forename: Natália Araújo Silva
authors.initials: NA
authors.lastname: Prado
authors.affiliation: Department of Dentistry, Rio de Janeiro School of Dentistry, State University of Rio de Janeiro, 222600-000 Rio de Janeiro, RJ, Brazil.
authors.forename: Reinaldo de Souza
authors.initials: Rde S
authors.lastname: Ferreira
authors.affiliation: Department of Materials Engineering, Pontifical Catholic University of Rio de Janeiro, 22451-045 Rio de Janeiro, RJ, Brazil.
authors.forename: Marcos Henrique de Pinho
authors.initials: MH
authors.lastname: Maurício
authors.affiliation: Department of Materials Engineering, Pontifical Catholic University of Rio de Janeiro, 22451-045 Rio de Janeiro, RJ, Brazil.
authors.forename: Sidnei
authors.initials: S
authors.lastname: Paciornik
authors.affiliation: Department of Dentistry, Rio de Janeiro School of Dentistry, State University of Rio de Janeiro, 222600-000 Rio de Janeiro, RJ, Brazil.
authors.forename: Mauro Sayão
authors.initials: MS
authors.lastname: de Miranda