title: Influence of fatigue testing and cementation mode on the load-bearing capability of bovine incisors restored with crowns and FRC posts.
abstract: The aim of the study was to evaluate the influence of fatigue and cementation mode on the fracture behaviour of endodontically treated bovine incisors restored with fiber-reinforced-composite (FRC) posts and crowns. Forty-eight endodontically treated incisors were restored with FRC posts, composite build-ups, and cast crowns. In 16 teeth, each of the posts were cemented conventionally with KetacCem (3M Espe) or adhesively with Panavia F (Kuraray) or RelyXUniCem (3M Espe). One-half of the specimens in each group were subjected to thermal cycling with 10,000 cycles at 5-55°C and mechanical aging, loading the specimens in 1,200,000 cycles with 50 N. Fracture resistance was determined by loading the specimens until fracture at an angle of 45°. The loading test showed that cementation mode and fatigue testing had an influence on the load bearing capability. Before fatigue testing no statistically significant differences between the different cementation modes could be detected. After fatigue testing, conventionally cemented FRC posts lead to statistically significant higher fracture loads compared to adhesively luted posts. Most specimens fractured in a favourable way, independent from the type of cementation.
authors.affiliation: Department of Prosthetic Dentistry and Dental Materials Sciences, Dental School and Clinics, Saarland University, Homburg Campus, Bldg. 71.2, 66421 Homburg/Saar, Germany. zmkfnot@uniklinikum-saarland.de
authors.forename: Frank P
authors.initials: FP
authors.lastname: Nothdurft
authors.forename: Thomas
authors.initials: T
authors.lastname: Schmitt
authors.forename: Stefan
authors.initials: S
authors.lastname: Rupf
authors.forename: Peter R
authors.initials: PR
authors.lastname: Pospiech
mesh_terms: D000818:Animals; D001732:Bite Force; D002417:Cattle; D003442:Crowns; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry / Q000627:therapeutic use*; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D007180:Incisor; D008277:Magnesium Oxide / Q000737:chemistry / Q000627:therapeutic use; D008422:Materials Testing; D011076:Polycarboxylate Cement / Q000737:chemistry / Q000627:therapeutic use; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry / Q000627:therapeutic use; D014082:Tooth Fractures / Q000517:prevention & control*; D016474:Weight-Bearing; D015034:Zinc Oxide / Q000737:chemistry / Q000627:therapeutic use
chemical_list: D003738:Dental Cements; C438843:Panavia-Fluoro; D011076:Polycarboxylate Cement; D019279:Resin Cements; D008277:Magnesium Oxide; C040235:Ketac-cem; D015034:Zinc Oxide