title: Push-out stress for fibre posts luted using different adhesive strategies.
abstract: The influence of thermocycling on the bond strength of fibre posts cemented with different luting approaches was investigated. A total of 84 human incisors were selected for the study. Sixty teeth were assigned to one of the following adhesive/cement combinations for push-out bond-strength evaluation: group 1, XP Bond/CoreXFlow + DT Light-Post; group 2, Panavia F 2.0 + Tech 21; or group 3, RelyX Unicem + RelyX. Bonded specimens were cut into 1-mm-thick slabs and either thermocycled (40,000 cycles) or stored in artificial saliva (control specimens) before push-out bond-strength testing. Additional specimens were processed for quantitative interfacial nanoleakage analysis. Thermocycling decreased the bond strength in specimens of groups 2 and 3, but did not affect the specimens from group 1. No difference was observed among luting approaches in control specimens. Thermocycling resulted in increased silver nitrate deposition (i.e. interfacial nanoleakage) in all groups. Within the limitations of the study, the use of an etch-and-rinse adhesive in combination with a dual-cure cement to lute fiber posts is the most stable luting procedure if compared with a self-etch resin-based cement or a self-adhesive cement, as assayed by thermocycling of the bonded specimens.
authors.affiliation: Department of SAU & FAL, University of Bologna, Bologna, Italy.
authors.forename: Annalisa
authors.initials: A
authors.lastname: Mazzoni
authors.forename: Giulio
authors.initials: G
authors.lastname: Marchesi
authors.forename: Milena
authors.initials: M
authors.lastname: Cadenaro
authors.forename: Giovanni
authors.initials: G
authors.lastname: Mazzotti
authors.forename: Roberto
authors.initials: R
authors.lastname: Di Lenarda
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Breschi
mesh_terms: D002484:Cementation; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry*; D003763:Dental Leakage / Q000145:classification; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry; D016622:Silver Staining; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature
chemical_list: D003738:Dental Cements; D017220:Dentin-Bonding Agents; C500742:ED Primer II; D008689:Methacrylates; C438843:Panavia-Fluoro; C483701:Rely X Unicem; D019279:Resin Cements; D012464:Saliva, Artificial; C532387:XP-Bond