title: Does hybridization of intraradicular dentin really improve fiber post retention in endodontically treated teeth?
abstract: This study tested the hypothesis that hybridization of intraradicular dentin eliminates interfacial gaps, thereby improving the coronal seal and retention of teeth restored with fiber posts. Post spaces were bonded with two types of fiber posts, using the corresponding etch-and-rinse adhesives and dual-cured resin cements. Longitudinal sections of the interfaces were examined for dentin hybridization in the coronal- and middle-thirds of the root canals. Resin replicas of these sections were evaluated for interfacial gap formation. Although intraradicular dentin hybridization was not compromised irrespective of whether the adhesives were light-cured before cementation, the universal occurrence of interfacial gaps along the hybrid layer surface or the post-cement interface reflects the challenge in bonding to post spaces with low compliance and high C-factors. The clinical success associated with bonded fiber posts is probably due predominantly to frictional retention.
authors.affiliation: Endodontic Unit, Department of Dental Sciences, Alma Mater Studiorum, University of Bologna, Via San Vitale 59, Bologna, Italy.
authors.forename: Chiara
authors.initials: C
authors.lastname: Pirani
authors.forename: Stefano
authors.initials: S
authors.lastname: Chersoni
authors.forename: Federico
authors.initials: F
authors.lastname: Foschi
authors.forename: Gabriela
authors.initials: G
authors.lastname: Piana
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Loushine
authors.forename: Franklin R
authors.initials: FR
authors.lastname: Tay
authors.forename: Carlo
authors.initials: C
authors.lastname: Prati
mesh_terms: D000134:Acid Etching, Dental; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002484:Cementation; D001840:Dental Bonding; D017268:Dental Prosthesis Retention; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D016628:Replica Techniques; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D019553:Tooth, Nonvital / Q000473:pathology*
chemical_list: D017220:Dentin-Bonding Agents; C431350:Duo-Link; D008689:Methacrylates; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C115612:single bond; C100742:All-Bond 2; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate