title: The effect of curing light and chemical catalyst on the degree of conversion of two dual cured resin luting cements.
abstract: The aim of this study was to evaluate the influence of different curing lights and chemical catalysts on the degree of conversion of resin luting cements. A total of 60 disk-shaped specimens of RelyX ARC or Panavia F of diameter 5 mm and thickness 0.5 mm were prepared and the respective chemical catalyst (Scotchbond Multi-Purpose Plus or ED Primer) was added. The specimens were light-cured using different curing units (an argon ion laser, an LED or a quartz-tungsten-halogen light) through shade A2 composite disks of diameter 10 mm and thickness 2 mm. After 24 h of dry storage at 37°C, the degree of conversion of the resin luting cements was measured by Fourier-transformed infrared spectroscopy. For statistical analysis, ANOVA and the Tukey test were used, with p ≤ 0.05. Panavia F when used without catalyst and cured using the LED or the argon ion laser showed degree of conversion values significantly lower than RelyX ARC, with and without catalyst, and cured with any of the light sources. Therefore, the degree of conversion of Panavia F with ED Primer cured with the quartz-tungsten-halogen light was significantly different from that of RelyX ARC regardless of the use of the chemical catalyst and light curing source. In conclusion, RelyX ARC can be cured satisfactorily with the argon ion laser, LED or quartz-tungsten-halogen light with or without a chemical catalyst. To obtain a satisfactory degree of conversion, Panavia F luting cement should be used with ED Primer and cured with halogen light.
authors.affiliation: Piracicaba Dental School, Department of Restorative Dentistry, University of Campinas-UNICAMP, Piracicaba, SP, Brazil. edujcsj@gmail.com
authors.forename: Eduardo José
authors.initials: EJ
authors.lastname: Souza-Junior
authors.forename: Lúcia Trazzi
authors.initials: LT
authors.lastname: Prieto
authors.forename: Giulliana Panfiglio
authors.initials: GP
authors.lastname: Soares
authors.forename: Carlos Tadeu dos Santos
authors.initials: CT
authors.lastname: Dias
authors.forename: Flávio Henrique Baggio
authors.initials: FH
authors.lastname: Aguiar
authors.forename: Luís Alexandre Maffei Sartini
authors.initials: LA
authors.lastname: Paulillo
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D002384:Catalysis; D055117:Curing Lights, Dental; D054020:Lasers, Gas; D008029:Lighting / Q000295:instrumentation; D011092:Polyethylene Glycols / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C438843:Panavia-Fluoro; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C425844:Scotchbond Multi-Purpose Plus; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate