title: The effect of polymerization conditions on the amounts of unreacted monomer and bisphenol A in dental composite resins.
abstract: The aim of this study was to analyze the unreacted monomers of four commonly used composite resins, which were released after curing with different polymerization conditions. Four composite resins, consisting of two hybrid types and two flowable types from two manufacturers, were photopolymerized using different curing times and curing distances. After polymerization, samples were extracted for analysis at different time points up to 24 h. Released monomers were analyzed by reversed-phase liquid chromatography at UV 210 nm. Longer curing times and shorter curing distances resulted in higher polymerization rates and decreased release of TEGDMA and UDMA, but changes in curing time and distance had no significant effect on Bis-GMA. Release of BPA increased with increase in curing time or decrease in curing distance, in contrast to the results of TEGDMA and UDMA. Polymerization conditions need to be differently applied according to both monomer and resin types.
authors.affiliation: Department of Preventive and Social Dentistry, Kyung Hee University.
authors.forename: Ha-Jeong
authors.initials: HJ
authors.lastname: Kwon
authors.forename: Yoon-Jong
authors.initials: YJ
authors.lastname: Oh
authors.forename: Jong-Hwa
authors.initials: JH
authors.lastname: Jang
authors.forename: Jung-Eun
authors.initials: JE
authors.lastname: Park
authors.forename: Kyung-Suk
authors.initials: KS
authors.lastname: Hwang
authors.forename: Yong-Duk
authors.initials: YD
authors.lastname: Park
mesh_terms: D001559:Benzhydryl Compounds / Q000737:chemistry*; D056148:Chromatography, Reverse-Phase; D003188:Composite Resins / Q000737:chemistry*; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010636:Phenols / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D013997:Time Factors; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D003188:Composite Resins; D008689:Methacrylates; D010636:Phenols; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D011140:Polyurethanes; C444701:Filtek Z250; C470230:Gradia; C510179:UniFil Flow; C533204:filtek Z350; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; C006780:bisphenol A; D000098826:Bisphenol A Compounds