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KMID : 0358920020290020180
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Journal of the Korean Academy of Pedodontics
2002 Volume.29 No. 2 p.180 ~ p.188
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THE COMPARATIVE STUDY OF THE MICROHARDNESS AND MICROLEAKAGE IN POLYMERIZATION OF COMPOSITE RESIN CURED WITH VISIBLE LIGHT AND PLASMA ARC CURING UNITS
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Namkoong Yong
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Abstract
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Newly developed curing units(plasma arc curing units) operate at relatively high intensity and are claimed to result in optimum properties of composite resin in a short curing time. The purpose of this study was to evaluate the microhardness and microleakage at the resin-tooth interface of two types of composite resins polymerized with visible light and plasma arc curing units. The results from the present study can be summarized as follows
1. Microhardness in each depth was shown to be higher in group AHL than AP3 & AP6. Group ZHL was lower than AP6 at surface(p<0.05) and had nstatisticallysignificantdifference at 1mm and 2mm(p)0.05). In other depths, group ZHL was higher than ZP3 and ZP6(p<0.05).
2. The incremental reduction in microhardness with depth was shown to be in all group except in surface-1mm of group AHL and 1?2mm of group ZHL(p<0.05).
3. Degree of microleakage in all groups were shown to be higher in gingival margin than occlusal margin but no statistically significant difference(p)0.05).
4. Differences between curing methods in microleakage were shown to be no statistically significant difference(p)0.05).
5. Differences between composite resins in microleakage were shown to be no statistically significant difference(p)0.05).
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