Surface microhardness of a resin composite exposed to a "first-generation" LED curing lamp, in vitro.
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.
Keogh
Pauraic
P
Ray
Noel J
NJ
Lynch
Christopher D
CD
Burke
Francis M
FM
Hannigan
Ailish
A
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
D003188:Composite Resins; C467914:TPH spectrum