title: Effect of thermoplastic filling techniques on the push-out strength of root sealing materials.
abstract: This study evaluates the effect of two thermoplastic obturation systems (MicroSeal and Obtura II) on bond strength of different sealers to intraradicular dentin. Sixty root canals of human canines were prepared using ProTaper rotary files (crown-down technique) and irrigated with 2.5% sodium hypochlorite and 17% EDTA. The root canals were filled by MicroSeal, Obtura II, or lateral compaction techniques using AH Plus and Epiphany SE. 1.5 mm thick root slices were subjected to the push-out test. ANOVA and Tukey's test showed that the bond strength values (MPa) observed in the groups obturated with MicroSeal (2.96 ± 2.72) and Obtura II (2.68 ± 2.18) did not significantly differ from each other (p > 0.05) but were significantly higher than that observed in the group obturated with lateral condensation (2.01 ± 1.48; p < 0.05). There were no statistically significant differences in strength (p > 0.05) among the root canal thirds (cervical: 2.44 ± 2.03; middle: 2.50 ± 2.27; and apical: 2.70 ± 2.34). Adhesive failures were predominant (60%) in all groups. In conclusion, MicroSeal and Obtura II techniques, using AH plus sealer, increased the resistance to displacement of the filling material, when compared with lateral compaction. Moreover, when used with Epiphany SE, these obturation systems did not affect the bond strength of the material to root dentin.
authors.affiliation: Dentistry Department, School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors.forename: Zigomar Hideo Fecchio Nasser
authors.initials: ZH
authors.lastname: Horiuchi
authors.affiliation: Dentistry Department, School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors.forename: Yara Teresinha Correa
authors.initials: YT
authors.lastname: Silva-Sousa
authors.affiliation: Dentistry Department, School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors.forename: Walter
authors.initials: W
authors.lastname: Raucci Neto
authors.affiliation: Dentistry Department, School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors.forename: Fuad Jacob Abi
authors.initials: FJ
authors.lastname: Rached-Junior
authors.affiliation: Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Aline Evangelista
authors.initials: AE
authors.lastname: Souza-Gabriel
authors.affiliation: Dentistry Department, School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors.forename: Silvio Rocha Corrêa da
authors.initials: SR
authors.lastname: Silva
authors.affiliation: Dentistry Department, School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors.forename: Edson
authors.initials: E
authors.lastname: Alfredo
mesh_terms: D000704:Analysis of Variance; D001840:Dental Bonding / Q000379:methods*; D019232:Dental Restoration Failure; D003804:Dentin / Q000187:drug effects; D004853:Epoxy Resins / Q000737:chemistry*; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D015203:Reproducibility of Results; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods*; D018709:Statistics, Nonparametric
chemical_list: D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C486893:epiphany sealer; C534916:epoxy resin-based root canal sealer; C113130:obtura II; D006171:Gutta-Percha