title: Compressive characteristics of an internally threaded post system.
abstract: OBJECTIVE
  The effects of oblique compressive forces were evaluated for extracted teeth restored with posts of solid and internally threaded designs.
  
  
  METHODS
  A group of 25 roots was restored with crowns supported by Para-post dowels and pin-retained composite resin cores, and a second group was restored with gold copings cast to internally threaded stainless steel-post prototypes. Samples were then embedded in epoxy resin and loaded at 45 degrees until failure. Failure force and type were statistically analyzed to determine statistical difference (P < .05) between groups.
  
  
  RESULTS
  No statistical difference was shown between groups for either fracture force or type.
  
  
  CONCLUSIONS
  The internally threaded post system resisted oblique loading forces similarly to a solid post system.
authors.affiliation: Ohio State University College of Dentistry, Columbus, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Laurell
authors.forename: P
authors.initials: P
authors.lastname: O'Neilly
authors.forename: W M
authors.initials: WM
authors.lastname: Johnston
mesh_terms: D000704:Analysis of Variance; D016009:Chi-Square Distribution; D003188:Composite Resins; D019245:Compressive Strength; D003442:Crowns; D003799:Dental Stress Analysis; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D013193:Stainless Steel; D019553:Tooth, Nonvital
chemical_list: D003188:Composite Resins; D013193:Stainless Steel