Abstract
Abstract Gas-liquid chromatography on a 10% polyethylene glycol column was found to be suitable for quantitative analysis of 2,3-diketo-1,7,7-trimethylnorcamphane which is used as an initiator for polymerization of visible light-cured resins. Five visible light-cured resin samples commercially available were analyzed by this method and it was found that all the samples tested contained more or less similar amounts of quinone, indicating that quinone is widely used as initiator in visible light-cured resins. Quinone was found not only in resin pastes but also in bonding agents, the concentration of quinone in these samples varied from brand to brand, and conventional resins which contained more filler showed a higher concentration of quinone than the microfilled resins tested.
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