title: Effect of various visible light photoinitiators on the polymerization and color of light-activated resins.
abstract: The purpose of this study was to investigate effects of various visible light photoinitiators on the polymerization efficiency and color of the light-activated resins. Four photoinitiators, including camphorquinone, phenylpropanedione, monoacrylphosphine oxide (TPO), and bisacrylphosphine oxide (Ir819), were used. Each photoinitiator was dissolved in a Bis-GMA and TEGDMA monomer mixture. Materials were polymerized using dental quartz-tungsten halogen lamp (QTH), plasma-ark lamp and blue LED light-curing units, and a custom-made violet LED light unit. The degree of monomer conversion and CIE L*a*b* color values of the resins were measured using a FTIR and spectral transmittance meter. The degree of monomer conversions of TPO- and Ir819-containing resins polymerized with the violet-LED unit were higher than camphorquinone-containing resin polymerized with the QTH light-curing unit. The lowest color values were observed for the TPO-containing resin. Our results indicate that the TPO photoinitiator and the violet-LED light unit may provide a useful and improved photopolymerization system for dental light-activated resins.
authors.affiliation: Department of Biomaterials Science, Graduate School of Medical and Dental Sciences, Kagoshima University. hiro@dentb.hal.kagoshima-u.ac.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Arikawa
authors.forename: Hideo
authors.initials: H
authors.lastname: Takahashi
authors.forename: Takahito
authors.initials: T
authors.lastname: Kanie
authors.forename: Seiji
authors.initials: S
authors.lastname: Ban
mesh_terms: D047188:Chalcones; D003116:Color; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects*; D055117:Curing Lights, Dental; D055115:Light-Curing of Dental Adhesives; D009636:Norbornanes; D044367:Phase Transition; D010720:Phosphines; D055668:Photochemical Processes
chemical_list: C520678:(2,4,6-trimethylbenzoyl) diphenylphosphine oxide; D047188:Chalcones; D003188:Composite Resins; D009636:Norbornanes; D010720:Phosphines; C100349:1-phenyl-1,2-propanedione