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J Korean Acad Pediatr Dent. 2001;28(2): 293-299.
A STUDY ON THE CHANGES IN POLYMERIZATION OF LIGHT-ACTIVATED COMPOSITE RESIN WITH VARIOUS EXPOSURE TIME AND DISTANCE
Myung-Ki Ahn, Tae-Sung Jeong, Shin Kim
Department of Pediatric Dentistry, College of Dentistry, Pusan National University
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ABSTRACT
The aim of this study was to evaluate the effect of the distance of the light tip to the surface of restoration and exposure time on the polymerization of surface and 2mm below the surface of light-activated composite resins. Two light-activated composite resins were used. From the experiment, the following results were obtained. 1. Relative light intensity rapidly decreased when distance of the light tip to the surface of material is more than 2mm(p<0.05). 2. In all groups, microhardness was increased according to the increase of relative light intensity and exposure time(p<0.05). 3. The distance of the light tip to the surface of restoration and exposure time more affected 2mm below the surface rather than the surface(p<0.05). 4. Although exposure time was increased, difference of microhardness of the 2mm below the surface with the distance of the light tip to the surface of restoration was relatively high in Z100 between below 4mm and other groups and Z250 between below 2mm and other groups(p<0.05).
Keywords: Light-activated composite resin | Exposure time | Distance | Microhardness
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