title: [Study of compression resistance of conventional or passive post and core reconstructed roots].
abstract: BACKGROUND
  The object of this study is to estimate if the reconstructed roots with passive post and core have a greater resistance to compression in relation to reconstructed roots with traditional post and core.
  
  
  METHODS
  Experimental situations have been reproduced as close as possible to real clinical situations simulating the cervical edge of the crown with a supporting cervical ring. A comparative analysis of the resistance to compression has been carried out using three groups of roots: the first group constructed from reconstructed roots with traditional post and core; the second group of reconstructed roots with passive post and core; the third group of roots were not reconstructed.
  
  
  RESULTS
  Our results have shown that if the root reconstruction includes a metallic support ring that goes beyond the root plate by at least 1 mm there is no difference in the resistance to compression of statistical significance between reconstructed roots with passive post and core and reconstructed roots with traditional post and core. It turns out instead that there is a significant increase in resistance to compression of the reconstructed roots (because of the presence of the cervical support ring) in respect of the third group of unreconstructed roots.
authors.affiliation: Cattedra di Odontoiatria Conservatrice, Università degli Studi, Torino.
authors.forename: M
authors.initials: M
authors.lastname: Sottosanti
authors.forename: M
authors.initials: M
authors.lastname: Pezzoli
authors.forename: M
authors.initials: M
authors.lastname: Carrozzo
mesh_terms: D000704:Analysis of Variance; D003442:Crowns / Q000592:standards; D003764:Dental Materials; D006801:Humans; D011176:Post and Core Technique; D016008:Statistical Distributions
chemical_list: D003764:Dental Materials