title: New methodology to evaluate bond strength of root-end filling materials.
abstract: This study evaluated the bond strength of root-end filling materials to root-end cavities using a new methodology. Twenty maxillary central incisors were subjected to biomechanical preparation (#80 hand file) and sectioned transversally 2 mm short of the apex and 4 mm coronally to this point. The root cylinders were embedded in acrylic resin and positioned at 45° to the horizontal plane for preparation of root-end cavities with a diamond ultrasonic retrotip. Two groups (n=10) were formed according to the root-end filling material: MTA and Super EBA. A gutta-percha cone (#80) was tug-backed at the limit between the canal and the root-end cavity. The cavity was filled and the gutta-percha cone was removed after complete setting of the sealer. The specimens were placed in an Instron machine with the root-end filling turned downwards. The push-out shaft was inserted in the space previously occupied by the gutta-percha cone and run at a crosshead speed of 1.0 mm/min for pushing out the root-end filling material. Data were analyzed by ANOVA (α=5%). Super EBA (6.03±1.31) presented higher bond strength (MPa) than MTA (1.81±0.45) (p>0.05). There was a predominance of cohesive failures for Super EBA and mixed for MTA. The protocol of specimen preparation is effective and introduces a specific methodology for assessing bond strength of root-end filling materials to dentin. Among the materials, Super EBA presented the highest bond strength.
authors.affiliation: School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brasil.
authors.forename: Jorge Henrique Stefaneli
authors.initials: JH
authors.lastname: Marques
authors.affiliation: School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brasil.
authors.forename: Yara Teresinha Corrêa
authors.initials: YT
authors.lastname: Silva-Sousa
authors.affiliation: School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brasil.
authors.forename: Fuad Jacob Abi
authors.initials: FJ
authors.lastname: Rached-Júnior
authors.affiliation: School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.
authors.forename: Jardel Francisco
authors.initials: JF
authors.lastname: Mazzi-Chaves
authors.affiliation: School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brasil.
authors.forename: Carlos Eduardo Saraiva
authors.initials: CE
authors.lastname: Miranda
authors.affiliation: School of Dentistry, Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brasil.
authors.forename: Silvio Rocha Correa
authors.initials: SR
authors.lastname: da Silva
authors.affiliation: Warwick Medical School, The University of Warwick, Coventry, United Kingdom.
authors.forename: Liviu
authors.initials: L
authors.lastname: Steier
authors.affiliation: School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.
authors.forename: Manoel Damião
authors.initials: MD
authors.lastname: Sousa-Neto
mesh_terms: D006801:Humans; D066298:In Vitro Techniques; D007180:Incisor; D008422:Materials Testing; D012387:Root Canal Filling Materials
chemical_list: D012387:Root Canal Filling Materials