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Effects of Internal Bleaching on the Adhesion of Glass-Fiber Posts
Paulo E de Oliveira Moreira1, Lucianne S Pamplona1, Gláucia C R Nascimento1
1Department of Dentistry, School of Dentistry of Federal University of Pará, Belém, Pará, Brazil.
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.
Significance:
Internal bleaching reduced the adhesion of GFPs luted with SARC. The adhesion of GFPs luted with CRC was not decreased after bleaching.
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