title: Comparison of fatigue for three prefabricated threaded post systems.
abstract: Post designs may have a direct effect on fracture resistance of endodontically treated teeth. This in vitro study compared the resistance of three prefabricated threaded post systems with lateral shearing forces. After endodontics were completed, prefabricated posts were inserted according to the manufacturer's instructions. A silver amalgam core was placed, and extracted human teeth were prepared to a standard size with a 1 mm gingival chamfer finished on sound dentino A cast was fabricated and cemented, and the specimens were thermocycled. The test samples were secured to an Instron testing machine and loaded until failure. Fracture patterns were recorded, fractured surface areas were measured, and compressive stresses were calculated. However, there were no statistically significant differences among threaded posts in each test group.
authors.affiliation: Department of Endodontics, New York University, College of Dentistry, New York, USA.
authors.forename: F H
authors.initials: FH
authors.lastname: Kahn
authors.forename: P A
authors.initials: PA
authors.lastname: Rosenberg
authors.forename: A
authors.initials: A
authors.lastname: Schulman
authors.forename: M
authors.initials: M
authors.lastname: Pines
mesh_terms: D002484:Cementation; D003723:Dental Amalgam; D003737:Dental Cavity Preparation; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D011475:Prosthesis Failure; D012390:Root Canal Therapy; D012834:Silver; D013193:Stainless Steel; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D014025:Titanium; D014082:Tooth Fractures / Q000503:physiopathology; D014092:Tooth Root / Q000503:physiopathology
chemical_list: D013193:Stainless Steel; D012834:Silver; D003723:Dental Amalgam; D014025:Titanium