Bond strength and fracture analysis between resin cements and root canal dentin

Authors

  • Guilherme Carpena Lopes DDS, MS, PhD,

    Corresponding author
    1. Operative Dentistry, Departamento de Odontologia, CCS, Universidade Federal de Santa Catarina, Florianópolis, Brazil
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  • Andressa Ballarin DDS,

    1. Operative Dentistry, Departamento de Odontologia, CCS, Universidade Federal de Santa Catarina, Florianópolis, Brazil
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  • Luiz N. Baratieri DDS, MS, PhD

    1. Operative Dentistry, Departamento de Odontologia, CCS, Universidade Federal de Santa Catarina, Florianópolis, Brazil
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Dr Guilherme Carpena Lopes, Dentística, Departamento de Odontologia, CCS, Campus Universitário, Florianópolis, Santa Catarina 88040-900, Brazil. Email: guilhermelopes@ccs.ufsc.br

Abstract

The aim of this research is to evaluate bond strength between translucent fibre posts (White Post DC, FGM or FRC Postec Plus, Ivoclar/Vivadent) and intraradicular dentin at three different levels (cervical, middle and apical) using a dual-cure (AllCem, FGM) or self-curing (Multilink, Ivoclar/Vivadent) resin cement. Also, the fracture type after push-out test was analysed under SEM. Thirty-two extracted single-root teeth were selected. After undergoing endodontic therapy, they were randomly divided into four groups according to their post type and resin cement. Root canals were etched using 37% phosphoric acid, and Excite DSC adhesive (Ivoclar/Vivadent) was applied in all groups. The root was sectioned to obtain nine 1-mm-thick slices (three per third: coronal, middle, apical). All slices were subjected to push-out tests. Data were analysed using two-way anova. The mean bond strengths vary from 6.6 (4.6) MPa [apical] to 11.9 (5.9) MPa [cervical]. There were no significant differences between groups. Pearson χ2-test revealed significant differences in fracture types for all groups (P < 0.0001). The apical third had the lowest bond strengths and it was also shown to be the most critical region for luting fibre posts.

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