title: Retention and failure morphology of prefabricated posts.
abstract: OBJECTIVE
  This study evaluated the effect of cement, post material, surface treatment, and shape (1) on the retention of posts luted in the root canals of extracted human teeth and (2) on the failure morphology.
  
  
  METHODS
  Posts of titanium alloy (ParaPost XH), glass fiber (ParaPost Fiber White), and zirconia (Cerapost) received one of several surface treatments-sandblasting, CoJet treatment, application of Metalprimer II, or sandblasting followed by silane application-and were then luted in the prepared root canal of human incisors and canines (n = 10). Following water storage at 37 degrees C for 7 days, retention was determined by extraction of the posts. Failure morphology of extracted posts was analyzed and quantified stereomicroscopically.
  
  
  RESULTS
  Type of luting cement, post material, and shape of post influenced the retention and failure morphology of the posts. Because of limited adherence of the cement to the root canal, surface treatments did not always have a positive effect on retention.
  
  
  CONCLUSIONS
  Choice of luting cement was critical for all three types of posts. Parallel posts showed superior retention to tapered posts.
authors.affiliation: Department of Dental Materials, School of Dentistry, University of Copenhagen, Denmark. ars@odont.ku.dk
authors.forename: Alireza
authors.initials: A
authors.lastname: Sahafi
authors.forename: Anne
authors.initials: A
authors.lastname: Peutzfeldt
authors.forename: Erik
authors.initials: E
authors.lastname: Asmussen
authors.forename: Klaus
authors.initials: K
authors.lastname: Gotfredsen
mesh_terms: D000704:Analysis of Variance; D002484:Cementation; D003481:Cuspid; D003738:Dental Cements; D045662:Dental Etching / Q000379:methods; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D005898:Glass; D006801:Humans; D007180:Incisor; D008422:Materials Testing; D011176:Post and Core Technique; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium; D015036:Zinc Phosphate Cement; D015040:Zirconium
chemical_list: D003738:Dental Cements; C438843:Panavia-Fluoro; C488490:ParaPost Cement; D019279:Resin Cements; C009753:fiberglass; C078770:De Trey's Zinc Cement; D015036:Zinc Phosphate Cement; D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide