title: Biaxial flexural strength of high-viscosity glass-ionomer cements heat-cured with an LED lamp during setting.
abstract: Adding heat to glass ionomers during setting might improve mechanical properties. The aim was to compare the biaxial flexural strength (BFS) between and within four glass ionomers, by time of exposure to a high-intensity LED light-curing unit. Materials and methods. Samples of Fuji 9 Gold Label, Ketac Molar Easymix, ChemFil Rock, and the EQUIA system were divided into three treatment groups (n = 30): without heating (Group 1), heated with LED lamp of 1400 mW/cm(2) for 30 s while setting (Group 2), and heated with LED lamp of 1400 mW/cm(2) for 60 s while setting (Group 3). Samples were stored for 48 hours in distilled water at 37°C until tested. BFS was tested, using a universal testing machine at a crosshead speed of 1 mm/min. Data were analyzed, using ANOVA test with the Bonferroni correction (α = 0.05). Heating the glass-ionomer cements with an LED curing light of 1400 mW/cm(2) during setting for 30 s increased the BFS value of all GICs. No statistically significant difference in mean BFS scores was found between the EQUIA system and ChemFil Rock at 30 s and 60 s. The mean BFS value was statistically significantly higher for the EQUIA system and ChemFil Rock than for Fuji 9 Gold Label and Ketac Molar Easymix at all exposure times.
authors.affiliation: Department of Dental Materials, Dental Faculty, National University of Córdoba, Maya de la Torre s/n, 5000 Córdoba, Argentina.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Fabián Molina
authors.forename: Ricardo Juan
authors.initials: RJ
authors.lastname: Cabral
authors.forename: Ignacio
authors.initials: I
authors.lastname: Mazzola
authors.forename: Laura
authors.initials: L
authors.lastname: Brain Lascano
authors.forename: Jo E
authors.initials: JE
authors.lastname: Frencken
mesh_terms: D000704:Analysis of Variance; D055117:Curing Lights, Dental; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D014783:Viscosity
chemical_list: D005899:Glass Ionomer Cements; C515713:Ketac Molar Easymix