title: The effect of curing mode on extent of polymerization and microhardness of dual-cured, self-adhesive resin cements.
abstract: OBJECTIVE
  To compare the effect of curing mode (self- or light-cure) on the extent of polymerization (%EP1 as measured using differential scanning calorimetry, (DSC) and microhardness of two dual-cured, self-adhesive resin cements, using a conventional, dual-cured resin cement as control.
  
  
  METHODS
  Small amounts of the commercial self-adhesive cements Maxcem and RelyX Unicem or Panavia F2.0 dual-cure resin based cement used as control were polymerized within the DSC chamber at 35 degrees C under a nitrogen atmosphere. 10 specimens were light-cured immediately (20 seconds, 600 mW/cm2) and left undisturbed for 2 hours and 10 additional specimens were left to self-cure in the dark for 2 hours. Following DSC treatment, microhardness of the specimens was measured (Vickers). For each test parameter, data were analyzed with a two-way ANOVA and the Tukey post hoc test.
  
  
  RESULTS
  %EP and microhardness of all cements were higher when the light-cure mode of dual-activation was used (P<0.05) instead of only self-curing. No significant difference in %EP was found between either self-adhesive cement or the control using either the light- or self-curing modes. In the light-activated mode, the conventional, dual-cure control cement demonstrated lower microhardness than the self-adhesive cements (P<0.05).
authors.affiliation: Department of SAU & FAL, University of Bologna, Bologna, Italy.
authors.forename: Milena
authors.initials: M
authors.lastname: Cadenaro
authors.forename: Chiara Ottavia
authors.initials: CO
authors.lastname: Navarra
authors.forename: Francesca
authors.initials: F
authors.lastname: Antoniolli
authors.forename: Annalisa
authors.initials: A
authors.lastname: Mazzoni
authors.forename: Roberto
authors.initials: R
authors.lastname: Di Lenarda
authors.forename: Frederick Allen
authors.initials: FA
authors.lastname: Rueggeberg
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Breschi
mesh_terms: D000704:Analysis of Variance; D002152:Calorimetry, Differential Scanning; D006244:Hardness; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D044367:Phase Transition; D019279:Resin Cements / Q000737:chemistry* / Q000528:radiation effects; D055116:Self-Curing of Dental Resins; D018709:Statistics, Nonparametric
chemical_list: C515955:Maxcem; C438843:Panavia-Fluoro; C483701:Rely X Unicem; D019279:Resin Cements