title: Influence of post type on degree of conversion of a resin-based luting agent.
abstract: OBJECTIVE
  To assess the degree of conversion (DC) at different levels of a resin-based luting agent used with different commercial posts.
  
  
  METHODS
  A resin-based luting agent (Variolink II) was light-cured in a simulated dowel space in combination with different fiber posts: GC Fiber Post (GC), DT Light Safety Lock (SL), RelyX Fiber Post (RX), Reforpost (RE), DT Light Post Illusion (LPI), FRC Postec Plus (FP), Radix (RA), Snowpost (SP), Dentin Post X (DP), Macrolock Illusion (MI), and Composipost (CP). After 24 hours, DC was assessed through micro-Raman analysis at the coronal, middle, and apical thirds. Two-way ANOVA and Tukey test were used for post-hoc comparisons (P<0.05).
  
  
  RESULTS
  The results demonstrated that the post-type, dowel space level, and between-factor interaction were statistically significant (P<0.001). Differences in DC were observed at different depths for RX, RE, LPI, SL, DP, MI and CP, decreasing from the coronal to the apical third. Although the resin-based luting agent should be able to polymerize in absence of light, a higher DC was found following light irradiation (with a decreasing effect from the coronal to the apical third).
authors.affiliation: Department of Biomedicine, Division of Dental Sciences and Biomaterials, University of Trieste, Italy.
authors.forename: Chiara Ottavia
authors.initials: CO
authors.lastname: Navarra
authors.forename: Cecilia
authors.initials: C
authors.lastname: Goracci
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Breschi
authors.forename: Alessandro
authors.initials: A
authors.lastname: Vichi
authors.forename: Gabriele
authors.initials: G
authors.lastname: Corciolani
authors.forename: Milena
authors.initials: M
authors.lastname: Cadenaro
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D004853:Epoxy Resins / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D015591:Microspectrophotometry; D011092:Polyethylene Glycols / Q000737:chemistry; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D004853:Epoxy Resins; D008689:Methacrylates; D011109:Polymethacrylic Acids; D019279:Resin Cements; C009753:fiberglass; C080508:poly(triethylene glycol dimethacrylate-1,6-bis(methacryloxy-2-ethoxycarbonylamino)-2,4,4-trimethylhexane) copolymer; D011791:Quartz; C103502:Variolink; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; D002244:Carbon; D015040:Zirconium