title: Analysis of the interface and bond strength of resin-based endodontic cements to root dentin.
abstract: This study evaluated by scanning electron microscopy the interface between root dentin and resin cements, with or without additional application of a dual-cured one-step self-etching dentin adhesive. In addition, the push-out bond strength of these materials to dentin was evaluated. Root canals of 50 maxillary human canines were subjected to biomechanical preparation and randomly assigned into five groups (n = 10) according to the obturation employed: I. AH Plus/gutta-percha; II. Endo-REZ/gutta-percha; III. Epiphany SE/Resilon; IV. Endo-REZ/gutta-percha + adhesive; and V. Epiphany SE/Resilon + adhesive. After obturation, two cross sections of 1.0 mm of each third of the root were obtained and analyzed by SEM and push-out. Data were analyzed by Kruskal-Wallis, Two-way ANOVA and Tukey's HSD tests (α = 5%). Significant differences occurred between scores for gap parameters and tags; greater tag formation resulted for Epiphany SE (P < 0.05). There were also significant differences between groups for the bond strength. AH Plus (1.24 ± 0.70) showed higher values (P < 0.05) compared to groups II (0,17 ± 0.19), III (0.10 ± 0.06), IV (0.09 ± 0.08), and V (0.06 ± 0.03), which were statistically similar (P > 0.05). There was no significant difference between the root thirds (P > 0.05). It was concluded that the use of a self-etching adhesive system did not improve the adhesion of resin-based sealers to dentin and that AH Plus showed better bond strength when compared to other cements.
authors.affiliation: Department of Dentistry, Positivo University, Av. Pedro Viriato Parigot de Souza, 5300, Campo Comprido, Curitiba, Paraná, Brasil. gi_haragushiku@yahoo.com.br
authors.forename: Gisele Aihara
authors.initials: GA
authors.lastname: Haragushiku
authors.forename: Cleonice Silveira
authors.initials: CS
authors.lastname: Teixeira
authors.forename: Adilson Yoshio
authors.initials: AY
authors.lastname: Furuse
authors.forename: Yara Terezinha Silva
authors.initials: YT
authors.lastname: Sousa
authors.forename: Manoel Damião
authors.initials: MD
authors.lastname: De Sousa Neto
authors.forename: Ricardo Gariba
authors.initials: RG
authors.lastname: Silva
mesh_terms: D003481:Cuspid / Q000737:chemistry / Q000648:ultrastructure; D003738:Dental Cements / Q000378:metabolism*; D003799:Dental Stress Analysis; D003804:Dentin / Q000378:metabolism* / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000378:metabolism*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D014092:Tooth Root / Q000737:chemistry* / Q000648:ultrastructure
chemical_list: D003738:Dental Cements; D017220:Dentin-Bonding Agents