Effect of internal bleaching agents on the bond strength of glass fiber posts to root dentine

Authors

  • Josemar Martins Ferreira Universidade Federal de Uberlândia
  • Sara Rodrigues Renovato Universidade Federal de Uberlândia
  • Fernanda Ribeiro Santana Universidade Federal de Goiás
  • Daniel de Almeida Decurcio Universidade Federal de Goiás
  • Carlos José Soares Universidade Federal de Uberlândia
  • Carlos Estrela Universidade Federal de Goiás

DOI:

https://doi.org/10.15448/1980-6523.2016.3.20490

Keywords:

Internal bleaching, Glass fiber posts, Bonding

Abstract

Objective: This study evaluated the effect of internal bleaching agents on the bond strength of glass fiber posts to root dentine.
Methods: Seventy bovine teeth were divided into 7 experimental groups (n=10) according to the bleaching agent used: SpH – sodium perborate + 20% hydrogen peroxide; SpW – sodium perborate + distilled water; Cp37 – 37% carbamide peroxide; Cp16 – 16% carbamide peroxide; Cp10 – 10% carbamide peroxide; H – 35% hydrogen peroxide; C – no bleaching agent (control). After bleaching, posts were cemented with a self-adhesive resin cement (RelyX U100) and the roots were crosssectioned to obtain two discs from each third. The posts underwent micropush-out testing, and bond strength values (MPa) were analyzed using ANOVA in a split-plot arrangement and the Tukey test (p<0.05). Failure mode was evaluated under confocal microscopy.
Results: There were no significant differences between the control and bleaching agent groups. Bond strength was greater in the cervical third of the 16% carbamide peroxide (Cp16) group than in the sodium perborate + 20% hydrogen peroxide (SpH) group. The cervical third had a higher bond strength than the apical third in the 10% carbamide peroxide (Cp10), 16% carbamide peroxide (Cp16) and sodium perborate + distilled water (SpW) groups, and no significant differences in the other groups. Adhesive cement-dentine failure was prevalent in all groups.
Conclusion: The use of internal bleaching agents did not decrease the bond strength of glass fiber posts to root dentin.

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2016-12-31

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