title: The contribution of friction to the dislocation resistance of bonded fiber posts.
abstract: This study tested the null hypothesis that the use of dentin adhesives produces no improvement on the fixation of fiber posts with resin cements in endodontically treated teeth. Post spaces were prepared in 36 single-rooted root-filled teeth. Silanized glass fiber posts were cemented to the post spaces using a self-etch (ED primer/Panavia 21) and a total etch resin cement (Excite DSC/Variolink II), with or without the accompanying dentin adhesives. Fixation strengths and interfacial ultrastructure were evaluated using a "thin slice" push-out test and transmission electron microscopy. For both resin cements, the fixation strengths obtained from specimens luted with resin cement only did not differ significantly from those in which the intraradicular dentin was first bonded with a dentin adhesive. In the presence of incomplete smear layer removal and interfacial gaps, the dislocation resistance of bonded fiber posts was contributed largely by sliding friction.
authors.affiliation: Department of Dental Materials, University of Siena, Policlinico "Le Scotte", viale Bracci, Siena, Italy. cecilia.goracci@tin.it
authors.forename: Cecilia
authors.initials: C
authors.lastname: Goracci
authors.forename: Andrea
authors.initials: A
authors.lastname: Fabianelli
authors.forename: Fernanda T
authors.initials: FT
authors.lastname: Sadek
authors.forename: Federica
authors.initials: F
authors.lastname: Papacchini
authors.forename: Franklin R
authors.initials: FR
authors.lastname: Tay
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D001840:Dental Bonding; D019232:Dental Restoration Failure; D017220:Dentin-Bonding Agents; D017276:Friction; D005898:Glass; D006801:Humans; D046529:Microscopy, Electron, Transmission; D010710:Phosphates; D011176:Post and Core Technique; D011897:Random Allocation; D019279:Resin Cements
chemical_list: D017220:Dentin-Bonding Agents; C093719:Panavia TPN-S; D010710:Phosphates; D019279:Resin Cements; C009753:fiberglass; C103502:Variolink