title: Photopolymerization of a dental nanocomposite as restorative material using the argon laser.
abstract: The aim of this study was to investigate the effect of power density and irradiation time of an argon laser on the physico-mechanical properties of light-cured dental nanocomposites. The composites were cured with 260 mW/cm(2) and 340 mW/cm(2) power densities at different irradiation times. The degree of conversion (DC), flexural strength, flexural modulus, water sorption, solubility and reaction temperature were measured. The maximum DC (50%), which was achieved after approximately 20 s irradiation, and the reaction temperature rise (20°C) were demonstrated by composite containing 20% filler cured at 340 mW/cm(2). The composite with 25% filler cured at 340 mW/cm(2) showed the highest flexural strength and modulus, which were 32.2 MPa and 1.89 GPa, respectively. The minimum water sorption (3.8%) and solubility (1.2%) were achieved with the composite containing 25% filler cured at 340 mW/cm(2). Finally, the composite with 25% filler cured at 340 mW/cm(2) showed higher physico-mechanical properties.
authors.affiliation: Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran. shahabmirsasaani@yahoo.com
authors.forename: Seyyed Shahabeddin
authors.initials: SS
authors.lastname: Mirsasaani
authors.forename: Mohammad M
authors.initials: MM
authors.lastname: Atai
authors.forename: Mohammad M
authors.initials: MM
authors.lastname: Hasani-Sadrabadi
mesh_terms: D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects; D055117:Curing Lights, Dental; D003764:Dental Materials / Q000737:chemistry / Q000528:radiation effects; D003793:Dental Restoration, Permanent; D055119:Elastic Modulus; D006801:Humans; D054020:Lasers, Gas; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry / Q000528:radiation effects; D055668:Photochemical Processes; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature
chemical_list: D003188:Composite Resins; D003764:Dental Materials