title: Fracture resistance of endodontically treated teeth restored by different FRC posts: an in vitro study.
abstract: BACKGROUND
  Posts and cores are often required for restoration of pulpless teeth and to provide retention and resistance for a complete crown, but conventional posts may increase the root fracture.
  
  
  OBJECTIVE
  This study was performed to compare the root fracture resistance of extracted teeth treated with different fibers reinforced with composite posts and treated teeth with conventional post and core systems.
  
  
  METHODS
  Root canal therapy was performed for 50 mandibular first premolars. The coronal portion of each tooth was amputated, and five post and core systems (cast, polyethylene woven, glass, carbon, and quartz fiber posts) were compared. Acrylic resin blocks were used for mounting, using a layer of elastomeric impression material covering the roots. The load was applied axially and measured with a universal testing machine.
  
  
  CONCLUSIONS
  Significantly, cast posts and cores had a higher failure threshold including teeth fracture; whereas, fiber posts failure was due to core fracture, with or without fractures in coronal portion of posts. Difference in FRC posts did not provide any significant difference in the load failure and the mode of fracture.
authors.affiliation: Department of Fixed Prosthodontics, Faculty of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. torabik@yahoo.com
authors.forename: Kianoosh
authors.initials: K
authors.lastname: Torabi
authors.forename: Farnaz
authors.initials: F
authors.lastname: Fattahi
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention / Q000295:instrumentation; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D008334:Mandible; D008422:Materials Testing; D011176:Post and Core Technique / Q000009:adverse effects / Q000295:instrumentation*; D012390:Root Canal Therapy / Q000295:instrumentation*; D018709:Statistics, Nonparametric; D014082:Tooth Fractures / Q000209:etiology*; D014092:Tooth Root / Q000293:injuries*; D019553:Tooth, Nonvital / Q000150:complications
chemical_list: D003188:Composite Resins; D003764:Dental Materials