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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name. |
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STUDIA CHEMIA - Issue no. 3 / 2011 | |||||||
Article: |
EVALUATION OF FREE RADICAL CONCENTRATION IN SOME NEW DENTAL COMPOSITE MATERIALS BY ESR SPECTROSCOPY. Authors: DOINA PRODAN, LAURA SILAGHI-DUMITRESCU, CRISTINA PREJMEREAN, RADU SILAGHI-DUMITRESCU, LAURA BOLOJAN, G. DAMIAN. |
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Abstract: During polymerization of dimethacrylate monomers employed in dental materials, the gel effect leads to entrapment of radicals and unreacted monomers in the crosslinked network, affecting physico-mechanical properties and the biocompatibility. Reported here is a study of the effect of the resin composition, irradiation time and storage time of some new light-cured dental composites upon the free propagating radical concentration, using Electron Spin Resonance (ESR). Six new experimental dental light-cured composites based on the Bis-GMA monomer - 2,2-bis[4-(2-hydroxy-3-methacryloyloxy-propoxy)phenyl]-propane, on the corresponding Bis-GMA dimer, 2-hydroxyethyl methacrylate (HEMA) and on 1,6-Bis-[2-methacryloyloxyethoxycarbonyl-amino]-2,4,4-trmethylhexane (UDMA) have been employed, with three different photoinitiator systems. The hybrid filler consisted of quartz, strontium/zirconium glass and fluoro-hydroxyapatite. ESR signals developed under visible light irradiation during polymerization were measured, with intensities dependent on the time of irradiation. These signals decay very slowly in time – on the scale of days or longer. Keywords: Resin composites; ESR ; Free radicals |
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