title: Reduced irradiation time in slow-curing of resin composite using an intensity-changeable light source.
abstract: Possibility to shorten the total irradiation time in slow-curing with an intensity-changeable light source, Curetron 7 (CT-7), was investigated for four hybrid-type resin composites. Irradiation condition with CT-7 was assigned as 10 or 20 seconds at low light intensity (230 mW/cm2) and followed by 20 or 10 seconds at high intensity (600 mW/cm2) respectively (i.e., a total of 30 seconds). For a reference, irradiation was carried out for 30 seconds using a halogen lamp (900 mW/cm2). After irradiation, mechanical properties of the cured composites--in terms of microhardness and flexural strength--were evaluated. Also, cavity adaptation was examined in standardized, cylindrical dentin cavities treated with an adhesive system. Compared to the reference irradiation, slow-curing with CT-7 produced acceptable mechanical properties and better adaptation. These results suggested that total exposure time of slow-curing with CT-7 could be shortened to 30 seconds.
authors: Section of Cariology and Operative Dentistry, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, 113-8549, Tokyo, Japan. abo.ope@tmd.ac.jp
authors: Tomoko
authors: T
authors: Abo
authors: Shigeru
authors: S
authors: Uno
authors: Junji
authors: J
authors: Tagami
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000528:radiation effects; D003188:Composite Resins / Q000528:radiation effects*; D003748:Dental Equipment; D018772:Dental Marginal Adaptation; D006244:Hardness; D006801:Humans; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000528:radiation effects; D044367:Phase Transition; D018583:Pliability; D012821:Silanes / Q000528:radiation effects; D012822:Silicon Dioxide / Q000528:radiation effects; D013997:Time Factors; D015040:Zirconium / Q000528:radiation effects
chemical_list: C098721:Aelitefil; C112828:Clearfil AP-X; D003188:Composite Resins; C444701:Filtek Z250; D008689:Methacrylates; D012821:Silanes; C083568:Z100 composite resin; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium