Iriyama, Nelson TetsuTango, Rubens Nisie [UNESP]Manetta, Izabella PaolaSinhoreti, Mário Alexandre CoelhoSobrinho, Lourenço CorrerAnzaloni Saavedra, Guilherme de Siqueira Ferreira [UNESP]2014-05-272014-05-272009-12-08Brazilian Oral Research, v. 23, n. 2, p. 108-112, 2009.1806-83241807-3107http://hdl.handle.net/11449/71469This study evaluated the Knoop hardness of a dual-cured resin cement (Rely-X ARC) activated solely by chemical reaction (control group) or by chemical / physical mode, light-cured through a 1.5 mm thick ceramic (HeraCeram) or composite (Artglass) disc. Light curing was carried out using conventional halogen light (XL2500) for 40 s (QTH); light emitting diodes (Ultrablue Is) for 40 s (LED); and Xenon plasma arc (Apollo 95E) for 3 s (PAC). Bovine incisors had their buccal face flattened and hybridized. On this surface a rubber mold (5 mm in diameter and 1 mm in height) was bulk filled with the resin cement. A polyester strip was seated for direct light curing or through the discs of veneering materials. After dry storage in the dark (24 h 37°C), the samples (n = 5) were sectioned for hardness (KHN) measurements, taken in a microhardness tester (50 gF load 15 s). The data were statistically analyzed by ANOVA and Tukey's test (α = 0.05). The cement presented higher Knoop hardness values with Artglass for QTH and LED, compared to HeraCeram. The control group and the PAC/Artglass group showed lower hardness values compared to the groups light-cured with QTH and LED. PAC/HeraCeram resulted in the worst combination for cement hardness values. © 2009 Sociedade Brasileira de Pesquisa Odontológica.108-112engComposite resinsDental porcelainHardnessResin cementsDCR cementRely XRely-Xresin cementanimalcattlechemistrydental bondingdental equipmentdenturehardnessmaterials testingmethodologyradiation exposurestandardsurface propertytimeAnimalsCattleCuring Lights, DentalDental Bonding, Chemically-CuredDental Bonding, Light-CuredDental VeneersHardness TestsMaterials TestingResin CementsSurface PropertiesTime FactorsArtigo10.1590/S1806-83242009000200003S1806-83242009000200003Acesso aberto2-s2.0-710491194572-s2.0-71049119457.pdf91387166804406030000-0003-0946-1826