title: Flexural strength of glass fibre-reinforced posts bonded to dual-cure composite resin cements.
abstract: The aims of this study were to evaluate the flexural strength of two different types of glass fibre-reinforced posts bonded to dual-cure composite resin cements. Forty glass methacrylate-based fibre posts (GC Fiber Post) and 20 glass fibre inter-polymerizing network posts (everStick POST) were divided into three groups. Group 1 contained 20 GC posts that were bonded to a dual-cure composite cement (UnifilCore). Group 2 contained 20 Stick Tech posts that had adhesive applied (Scotchbond Multipurpose resin) and were bonded to a dual-cure composite resin cement (RelyX Unicem). Group 3 contained 20 GC posts that were pretreated with a silane-coupling agent before being treated with resin and composite, as in group 1. A 4-point bend test was carried out to failure on all of the groups. Failure modes were determined using scanning electron microscopy. Pretreatment of the post surface with the silane-coupling agent did not increase the flexural strength. The flexural strength of the Stick Tech post was significantly lower than the flexural strength of the GC post. The mode of failure for the GC Posts was adhesive, whereas the Stick Tech posts failed cohesively. Different flexural strengths and failure modes were observed among the two fibre post-resin systems.
authors.affiliation: Department of Primary Dental Care, Kings College London Dental Institute, Guys and St Thomas Hospitals, Kings College London, London, UK.
authors.forename: Peter
authors.initials: P
authors.lastname: Davis
authors.forename: Luciana S D
authors.initials: LS
authors.lastname: Melo
authors.forename: Richard M
authors.initials: RM
authors.lastname: Foxton
authors.forename: Martyn
authors.initials: M
authors.lastname: Sherriff
authors.forename: Peter
authors.initials: P
authors.lastname: Pilecki
authors.forename: Francesco
authors.initials: F
authors.lastname: Mannocci
authors.forename: Timothy F
authors.initials: TF
authors.lastname: Watson
mesh_terms: D000268:Adhesiveness; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D018583:Pliability; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry*; D055116:Self-Curing of Dental Resins; D012821:Silanes / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D016019:Survival Analysis
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; C483701:Rely X Unicem; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D012821:Silanes; C500741:Unifil Core; C496140:everStick; C009753:fiberglass