title: HPLC analysis of eluted monomers from two composite resins cured with LED and halogen curing lights.
abstract: This study investigated the leaching of monomers (Bis-GMA and TEGDMA) from nano-hybrid (Filtek Supreme) and flowable (Filtek Flow) dental composite resins cured with LED or conventional halogen curing lights, and immersed in saliva or water for 24 h. Nine disc specimens were made for each experimental group. After the polymerization process, the specimens were immersed in either water or saliva and incubated at 37 degrees C for 24 h. Eluted Bis-GMA and TEGDMA monomers were detected using high performance liquid chromatography (HPLC). The data were analyzed using three-way ANOVA (p = 0.05) and the independent samples t test. TEGDMA (53.15-1 microg/L) was leached from the resins at a higher level than Bis-GMA (28-0.5 microg/L) (p < 0.01), regardless of the affecting factors: composite type, solvent (media) and type of curing light. In general, Filtek Flow resin released more TEGDMA than Filtek Supreme (p < 0.05), but the Supreme resin released more Bis-GMA than TEGDMA (p < 0.05). Halogen light induced greater monomer elution than LED light immersion in water. Saliva released more TEGDMA than water (p < 0.05). We conclude that (1) total leached TEGDMA was higher than total Bis-GMA, (2) saliva and halogen light (lower intensity than LED) leached more monomers from the resins, and (3) the flowable composite resin leached more TEGDMA than the nano-hybrid.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Tehran University of Medical Sciences and Dental Research Center, Tehran, Iran. hasanita@sina.tums.ac.ir
authors.forename: Masumeh Hasani
authors.initials: MH
authors.lastname: Tabatabaee
authors.forename: Hosein
authors.initials: H
authors.lastname: Mahdavi
authors.forename: Shiller
authors.initials: S
authors.lastname: Zandi
authors.forename: M J
authors.initials: MJ
authors.lastname: Kharrazi
mesh_terms: D016475:3T3 Cells; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D006219:Halogens / Q000737:chemistry*; D008422:Materials Testing; D051379:Mice; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry*; D012463:Saliva; D012997:Solvents / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C467913:Filtek Flow; C474035:Filtek Supreme; D006219:Halogens; D011108:Polymers; D011109:Polymethacrylic Acids; D012997:Solvents; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate