title: Bond strength and fracture analysis between resin cements and root canal dentin.
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 χ(2)-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.
authors.affiliation: Operative Dentistry, Departamento de Odontologia, CCS, Universidade Federal de Santa Catarina, Florianópolis, Brazil. guilhermelopes@ccs.ufsc.br
authors.forename: Guilherme Carpena
authors.initials: GC
authors.lastname: Lopes
authors.forename: Andressa
authors.initials: A
authors.lastname: Ballarin
authors.forename: Luiz N
authors.initials: LN
authors.lastname: Baratieri
mesh_terms: D000704:Analysis of Variance; D001840:Dental Bonding / Q000379:methods*; D003786:Dental Pulp Cavity / Q000737:chemistry*; D003799:Dental Stress Analysis; D003804:Dentin / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry*; D012390:Root Canal Therapy / Q000295:instrumentation / Q000379:methods
chemical_list: D017220:Dentin-Bonding Agents; D019279:Resin Cements