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The purpose of this study was to use a three-component photoinitiation system comprising 1wt% CQ (camphorquinone), 2wt% DMAEMA (2-(dimethylamino) ethyl meth acrylate) and 2wt% Ph2I+PF6− (diphenyliodonium hexafluorophosphate) to initiate the copolymerization of the matrix resins which combine bisphenol-S-bis (3-methacrylate-2-hydroxy propyl) ether (BisS-GMA) with the expanding monomer unsaturated...