title: Mechanical effect of static loading on endodontically treated teeth restored with fiber-reinforced posts.
abstract: The aim of this study was to investigate the mechanical behavior of a dental system built up with fiber-reinforced composite (FRC) endodontic posts with different types of fibers and two cements (the first one used with a primer, the second one without it). Six FRC posts were used. Each system was characterized in terms of structural efficiency under external applied loads similar to masticatory forces. An oblique force was applied and stiffness and maximum load data were obtained. The same test was used for the dentine. The systems were analyzed by scanning electron microscope (SEM) to investigate the surface of the post and inner surface of root canal after failure. The mechanical tests showed that load values in dental systems depend on the post material and used cement. The highest load (281 ± 59 N) was observed for the conical glass fiber posts in the cement without primer. There was a 50 and 85% increase in the maximum load for two of the conical posts with glass fibers and a 229% increase for the carbon fiber posts in the cement without primer as compared with the cement with primer. Moreover, almost all the studied systems showed fracture resistances higher than the typical masticatory loads. The microscopic analysis underlined the good adhesion of the second cement at the interfaces between dentine and post. The mechanical tests confirmed that the strength of the dental systems subjected to masticatory loads was strictly related to the bond at the interface post/cement and cement/dentine.
authors.affiliation: University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima, 4 - 05100, Terni, Italy.
authors.forename: Manila
authors.initials: M
authors.lastname: Chieruzzi
authors.forename: Marco
authors.initials: M
authors.lastname: Rallini
authors.forename: Stefano
authors.initials: S
authors.lastname: Pagano
authors.forename: Stefano
authors.initials: S
authors.lastname: Eramo
authors.forename: Potito
authors.initials: P
authors.lastname: D'Errico
authors.forename: Luigi
authors.initials: L
authors.lastname: Torre
authors.forename: José M
authors.initials: JM
authors.lastname: Kenny
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D006801:Humans; D008422:Materials Testing; D008954:Models, Biological; D011140:Polyurethanes / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D013314:Stress, Mechanical; D016474:Weight-Bearing
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D003738:Dental Cements; D011140:Polyurethanes; D012387:Root Canal Filling Materials
keywords: SEM techniques; dental restoration; endodontic fiber posts; mechanical properties; polymer Composites