title: Relative efficiency of radiation sources for photopolymerization.
abstract: The aim of this study was to evaluate the characteristics of new-generation light-emitting diode (LED) units in comparison with the conventional tungsten-halogen, plasma arc, and first-generation LED units reported in our previous study. The irradiance of light from new-generation LED units, the temperature rise of the bovine enamel surface, and the depth of cure of composites exposed to each unit were investigated. The irradiances in the range 400-515 nm emitted from the new-generation LED units were greater than those from the first-generation LED units. The temperature increase was 15-25 degrees C for new-generation LED units compared with a typical value of 5 degrees C for the first-generation LED units at 10 s of irradiation. The relationship between the depth of cure and the logarithm of total exposure energy suggested that LED units can cure light-cured composite resins more efficiently than tungsten-halogen or plasma arc units.
authors.affiliation: Department of Dental Engineering, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama 230-8501, Japan. nomoto-r@tsurumi-u.ac.jp
authors.forename: Rie
authors.initials: R
authors.lastname: Nomoto
authors.forename: John F
authors.initials: JF
authors.lastname: McCabe
authors.forename: Keiko
authors.initials: K
authors.lastname: Nitta
authors.forename: Susumu
authors.initials: S
authors.lastname: Hirano
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000528:radiation effects*; D055117:Curing Lights, Dental / Q000145:classification; D003743:Dental Enamel / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation* / Q000379:methods; D013696:Temperature
chemical_list: D003188:Composite Resins