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KMID : 0358920060330040624
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Journal of the Korean Academy of Pedodontics
2006 Volume.33 No. 4 p.624 ~ p.632
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Effects of plasma arc curing lights on the surface hardness of the composite resins
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Lee Soo-Won
Yang Kyu-Ho
Kim Seon-Mi
Choi Nam-Ki
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Abstract
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In recent years, xenon plasma arc lamp was introduced for high-intensity curing of composite filling materials in direct resin restorations. In this study, two types of restorative materials, namely composites point 4 {(R)} and Z250 {(R)} were selected and curing was conducted using a conventional halogen light and two plama curing lights. Two different resin composites were cured using the different units(Flipo {(R)}, Ultra-lite 180A, and TriLight {(R)}) and tested for microhardness.
The purpose of this study was to test the hypothesis that exposure to a plasma curing lamp for 3, 6. 9 seconds is equivalent to 20 or 40 seconds of irradiation using a conventional halogen curing unit.
1. Flipo {(R)} and Ultra-lite 180A were able to polymerize point 4 {(R)} at 6 seconds to a degree equal to that of the TriLight {(R)}(control) at 40 seconds.
2. Flipo {(R)} was able to polymerize Z250 {(R)} at 9 seconds to a degree equal to that of the TriLight^{(R)}(control) on the bottom surface at 20 seconds. whereas Ultra-lite 180A could not do.
3. Two plasma curing units were able to cure the test-composites with bottom/top ratios approximately 61% to 96% at 3 to 9 seconds. There were some differences between the two composite brands, with Z250 {(R)} displaying less difference between top and bottom hardness values. For point 4 {(R)} and Z250 {(R)}, at least 6 or 9 seconds were necessary to produce microhardness equivalent to that of the TriLight {(R)} curing at 20 or 40 seconds.
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KEYWORD
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Plasma curing lights, Composite resins, Microhardness
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