title: Surface microhardness of a resin composite exposed to a "first-generation" LED curing lamp, in vitro.
abstract: This investigation determined the minimum exposure times consistent with optimised surface microhardness parameters for a commercial resin composite cured using a "first-generation" light-emitting diode activation lamp. Disk specimens were exposed and surface microhardness numbers measured at the top and bottom surfaces for elapsed times of 1 hour and 24 hours. Bottom/top microhardness number ratios were also calculated. Most microhardness data increased significantly over the elapsed time interval but microhardness ratios (bottom/top) were dependent on exposure time only. A minimum exposure of 40 secs is appropriate to optimise microhardness parameters for the combination of resin composite and lamp investigated.
authors.forename: Pauraic
authors.initials: P
authors.lastname: Keogh
authors.forename: Noel J
authors.initials: NJ
authors.lastname: Ray
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Lynch
authors.forename: Francis M
authors.initials: FM
authors.lastname: Burke
authors.forename: Ailish
authors.initials: A
authors.lastname: Hannigan
mesh_terms: D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D006244:Hardness; D006801:Humans; D008029:Lighting / Q000295:instrumentation*; D008422:Materials Testing; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003188:Composite Resins; C467914:TPH spectrum