title: Effectiveness of surface protection of resin modified glass ionomer cements evaluated spectrophotometrically.
abstract: The effectiveness of four surface protectors for resin-modified glass ionomer cements was evaluated by spectrophotometrically determining dye uptake. Ninety specimens, 3.0 mm in diameter and 1.0 mm in height, were made with Photac-Fil, Fuji II LC and Vitremer and divided into six groups for each material. Positive and negative controls were not protected while experimental specimens were protected with proprietary glaze, nail varnish, flowable resin and glaze. The discs were immersed in 0.1% methylene blue solution for 10 minutes after mixing, except for those negative control specimens that were immersed in deionized-water. After 24 hours, the specimens were washed and the protectors trimmed with Sof-Lex discs. The specimens were then removed from the matrixes and individually placed in 1.5 mL of 65% nitric acid for five hours. The absorbance was determined spectrophotometrically at 590 nm. Dye uptake was expressed in microgram dye/specimen. The data were analyzed by two-way ANOVA and Tukey-Kramer tests. All surface protectors tested were effective. For Fuji II LC and Vitremer no differences were observed among tested protections. For Photac-Fil, nail varnish showed better performance than the proprietary glaze.
authors.affiliation: Bauru Dental School, University of São Paulo, Department of Operative Dentistry, Baru, SP, Brazil.
authors.forename: D F
authors.initials: DF
authors.lastname: Cefaly
authors.forename: B G
authors.initials: BG
authors.lastname: Seabra
authors.forename: C M
authors.initials: CM
authors.lastname: Tapety
authors.forename: E M
authors.initials: EM
authors.lastname: Taga
authors.forename: F
authors.initials: F
authors.lastname: Valera
authors.forename: M F
authors.initials: MF
authors.lastname: Navarro
mesh_terms: D000042:Absorption; D000704:Analysis of Variance; D020099:Coated Materials, Biocompatible; D003188:Composite Resins / Q000737:chemistry; D003793:Dental Restoration, Permanent; D005899:Glass Ionomer Cements / Q000737:chemistry*; D007764:Lacquer; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D013053:Spectrophotometry; D018709:Statistics, Nonparametric; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D020099:Coated Materials, Biocompatible; D003188:Composite Resins; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008689:Methacrylates; C081144:Photac-Fil; D012117:Resins, Synthetic; C084550:Vitremer; D014867:Water; C005044:hydroxyethyl methacrylate