Abstract
The influence of initiator systems of visible-light curing resin on the polymerization behavior was investigated using DSC kept at 37℃.The experimental visible-light curing resin used here consisted of triethylene glycol dimethacrylate(3G)monomer, a photosensitizer and a reducing agent.The photosensitizers were dl-camphorquinone(CQ), 9-fluorenone(FL)and benzil(BZ), and the reducing agents examined were N, N-dimethylaminoethyl methacrylate(DAEMA), thiophenol(TP), 4-mercaptophenylmethacrylamide(MPMA), thiosalicylic acid(TSA), 3-mercaptopropionic acid(MPA), and 2-mercaptoethanol(ME).The most effective photosensitizer was CQ, and the CQ-DAEMA system gave the values of T(time at maximum exothermic peak)=0.6〜0.7 min, and R(maximum exothermic rate)=16〜18mcal/sec under the conditions employed.The addition of reducing agents containing SH group to 3G and CQ visible-light curing resins also resulted in the promotion of polymerization by visible-light irradiation.The tendency was more significant in the case of thiophenol derivatives, when compared with thioalcohol derivatives.Especially, TP exhibited an excellent acceleration effect in polymerization of 3G and the effect was comparable to that of DAEMA.
