title: Influence of fluorescent dye on physical-mechanical properties of luting cements for confocal microscopy analysis.
abstract: OBJECTIVE
  To evaluate the influence of a fluorescent dye (rhodamine B) on the physical and mechanical properties of three different luting cements: a conventional adhesive luting cement (RelyX ARC, 3M/ESPE), a self-adhesive luting cement (RelyX U-200, 3M/ESPE), and a self-etching and self-adhesive luting cement (SeT PP, SDI).
  
  
  METHODS
  The cements were mixed with 0.03 wt% rhodamine B, formed into bar-shaped specimens (n = 10), and light cured using an LED curing unit (Radii, SDI) with a radiant exposure of 32 J/cm(2) . The Knoop hardness (KHN), flexural strength (FS), and Young's modulus (YM) analyses were evaluated after storage for 24 h.
  
  
  RESULTS
  Outcomes were subjected to two-way ANOVA and Tukey's test (P = 0.05) for multiple comparisons. No significant differences in FS or YM were observed among the tested groups (P ≥ 0.05); the addition of rhodamine B increased the hardness of the luting cements tested.
  
  
  CONCLUSIONS
  The addition of a fluorescent agent at 0.03 wt% concentration does not negatively affect the physical-mechanical properties of the luting cement polymerization behavior.
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas -UNICAMP, Sao Paulo, Brazil.
authors.forename: Dayane
authors.initials: D
authors.lastname: Oliveira
authors.forename: Lúcia
authors.initials: L
authors.lastname: Prieto
authors.forename: Cíntia
authors.initials: C
authors.lastname: Araújo
authors.forename: Erick
authors.initials: E
authors.lastname: Coppini
authors.forename: Gisele
authors.initials: G
authors.lastname: Pereira
authors.forename: Luís
authors.initials: L
authors.lastname: Paulillo
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate; D003738:Dental Cements / Q000737:chemistry*; D003799:Dental Stress Analysis; D005456:Fluorescent Dyes; D006244:Hardness; D018613:Microscopy, Confocal; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D012235:Rhodamines / Q000737:chemistry*
chemical_list: D003738:Dental Cements; D005456:Fluorescent Dyes; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D012235:Rhodamines; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C029773:rhodamine B
keywords: Knoop hardness; flexural strength; rhodamine B; young modulus