title: Effect of the activation mode of post adhesive cementation on push-out bond strength to root canal dentin.
abstract: OBJECTIVE
  To evaluate the effect of the activation mode of adhesive cementation on push-out bond strength of fiber-reinforced resin posts to root canal dentin.
  
  
  METHODS
  Forty mandibular premolars were endodontically treated and randomly divided into 4 equal groups. In groups G-1, G-2, and G-3, Single Bond (3M Espe) was applied and light polymerized for 20 seconds; in group G-4, Scotchbond Multi-Purpose Plus (3M Espe) was used as an autopolymerized adhesive. The dual-cure resin cement Rely X ARC (3M Espe) was light polymerized in G-2 and G-3 but not in G-1 and G-4. The translucent post Light-Post (Bisco) was used in G-3 and the opaque post Aestheti-Plus (Bisco) in the other groups. The roots were sectioned in 3 parts (cervical, middle, apical); each slice was submitted to the push-out test at a crosshead speed of 0.5 mm/min. Data were analyzed by analysis of variance and Tukey test (a = .05).
  
  
  RESULTS
  Light polymerization of both the adhesive and resin cement in G-2 led to significantly higher bond strength than in G-1, where only the adhesive was light polymerized. No difference was found between G-2 (opaque post) and G-3 (translucent post). The autopolymerized adhesive showed the highest bond strength in all root regions. The middle and apical post/root regions had similar bond strength, but it was significantly lower than that in the cervical region (P <.001).
  
  
  CONCLUSIONS
  Bond strength to root dentin varied as a function of the activation mode of post adhesive cementation and post/root regions.
authors.affiliation: Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina, Brazil. luisboff@uol.com.br
authors.forename: Luis Leonildo
authors.initials: LL
authors.lastname: Boff
authors.forename: Márcio Lima
authors.initials: ML
authors.lastname: Grossi
authors.forename: Luiz Henrique Maykot
authors.initials: LH
authors.lastname: Prates
authors.forename: Luiz Henrique
authors.initials: LH
authors.lastname: Burnett
authors.forename: Rosemary Sadami Arai
authors.initials: RS
authors.lastname: Shinkai
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry* / Q000528:radiation effects; D003738:Dental Cements / Q000737:chemistry* / Q000528:radiation effects; D006801:Humans; D011092:Polyethylene Glycols / Q000737:chemistry* / Q000528:radiation effects; D011109:Polymethacrylic Acids / Q000737:chemistry* / Q000528:radiation effects; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry*
chemical_list: D003738:Dental Cements; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C425844:Scotchbond Multi-Purpose Plus; C115612:single bond; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate