Surface microhardness of a resin composite exposed to pulse-delayed plasma arc lamp irradiation, in vitro.
Groups of samples of a light-activated resin composite were exposed, using a 3-step pulse-delayed protocol, to a plasma arc unit. Further groups were exposed with the light-curing guide positioned at increasing distances from the composite surface. The pulse-delayed protocol yielded a progressive increase in microhardness number at the end of each step but with a maximum mean value significantly less than the controls. Increasing the irradiation distance yielded a progressive and significant decrease in microhardness number.
Hickey
Audrey
A
Department of Restorative Dentistry, National University of Ireland, Cork, Ireland.
Lynch
Christopher D
CD
Ray
Noel J
NJ
Burke
Francis M
FM
Hannigan
Ailish
A
D000704:Analysis of Variance; D003188:Composite Resins / Q000528:radiation effects*; D006244:Hardness / Q000528:radiation effects*; D006245:Hardness Tests; D008027:Light; D008422:Materials Testing; D012044:Regression Analysis; D018709:Statistics, Nonparametric; D013674:Technology, Dental / Q000379:methods
D003188:Composite Resins; C420128:Spectrum composite resin