Title: COMMERCIAL DENTAL COMPOSITE: DETERMINATION OF REACTION ADVANCEMENT AND STUDY OF THE MIGRATION OF ORGANIC COMPOUNDS
Page Range: p.223-234
Author(s): Sanglar C; Defay M; Waton H; Bonhommme A; Alamercery S; Baudot R; Piasse O; Grenier-Loustalot M F
File size: 201K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 13
Issue No: No. 3
Abstract
This work investigates the role of residual reactive methacrylate functions a the end of the photopolymerisation cycle of organic dental composites, and examines the behaviour of the residual monomers and oligomers in organic (ethanol) and aqueous (water and artificial saliva) media. Results indicate that all the methacrylate monomers present in dentine migrate into ethanol, whereas in aqueous media, only the most hydrophilic monomer (urethane dimethacrylate(UDMA)) migrated into water and artificial saliva. The desorption in the three media is accompanied by the hydrolysis of monomers, leading to the formation of monohydrolysed UDMA and bisphenyl glycidyl dimethacrylate (BISGMA). UDMA and BISGMA were completely hydrolysed in the artificial saliva. It was suggested that the alkalinity of the medium favoured the hydrolysis of methacrylate functions. 26 refs.
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