Journal of the Korean Academy of Pediatric Dentistry 2006;33(4):624-632.
Published online November 30, 2006.
Effects of plasma arc curing lights on the surface hardness of the composite resins
Soo-Won Lee, Kyu-Ho Yang, Seon-Mi Kim, Nam-Ki Choi
전남대학교 치과대학 소아치과학교실 및 치의학 연구소 
Correspondence:  Nam-Ki Choi, 
Abstract
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® and Z250® 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®, Ultra-lite 180A, and TriLight®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® and Ultra-lite 180A were able to polymerize point 4® at 6 seconds to a degree equal to that of the TriLight®(control) at 40 seconds. 2. Flipo® was able to polymerize Z250® at 9 seconds to a degree equal to that of the TriLight®(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® displaying less difference between top and bottom hardness values. For point 4® and Z25®, at least 6 or 9 seconds were necessary to produce microhardness equivalent to that of the TriLight® curing at 20 or 40 seconds.
Key Words: Plasma curing lights, Composite resins, Microhardness


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