title: Effects of Internal Bleaching on the Adhesion of Glass-Fiber Posts.
abstract: OBJECTIVE
  We evaluated the effects of internal bleaching on the adhesion of glass-fiber posts (GFPs) luted with different resin cements.
  
  
  METHODS
  Forty extracted human single-root teeth were endodontically treated and divided into four groups (n=10): G1- conventional resin cement (CRC); G2- self-adhesive resin cement (SARC); G3- bleaching + CRC; and G4- bleaching + SARC. Specimens were sectioned transversally into three slices to perform the push-out test at the coronal, middle and apical regions of the root canals. Data were analyzed using analysis of variance and Tukey's test (p<0.05).
  
  
  RESULTS
  The push-out bond strength of GFPs luted with SARC after bleaching (G4) was significantly lower than that of the other groups (p<0.001). We found no statistically significant differences in push-out bond strength among the other groups.
  
  
  CONCLUSIONS
  Internal bleaching reduced the adhesion of GFPs luted with SARC. The adhesion of GFPs luted with CRC was not decreased after bleaching.
authors.affiliation: Department of Dentistry, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil.
authors.forename: Paulo E
authors.initials: PE
authors.lastname: de Oliveira Moreira
authors.affiliation: Department of Dentistry, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil.
authors.forename: Lucianne S
authors.initials: LS
authors.lastname: Pamplona
authors.affiliation: Department of Dentistry, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil.
authors.forename: Gláucia C R
authors.initials: GC
authors.lastname: Nascimento
authors.affiliation: Department of Prosthodontics, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil.
authors.forename: Renata A
authors.initials: RA
authors.lastname: Esteves
authors.affiliation: Department of Endodontics, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil.
authors.forename: Oscar F
authors.initials: OF
authors.lastname: Pessoa
authors.affiliation: Department of Dentistry, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil.
authors.forename: Cecy M
authors.initials: CM
authors.lastname: Silva
keywords: Dental bleaching; dental bonding; dentin-bonding agents; hydrogen peroxide; resin cements; tooth bleaching.