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Surface microhardness of a resin composite exposed to pulse-delayed plasma arc lamp irradiation, in vitro
Audrey Hickey1, Christopher D Lynch, Noel J Ray
1Department of Restorative Dentistry, National University of Ireland, Cork, Ireland.
The European Journal of Prosthodontics and Restorative Dentistry
|October 18, 2002
Abstract:
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.