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KMID : 0362219950220020123
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Journal of The Korean Research Society for Dental Materials
1995 Volume.22 No. 2 p.123 ~ p.130
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A STUDY ON THE COLOR STABILITY AND WATER SORPTION OF DENTACOLOR RESIN SYSTEM
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Choi Yu-Seok
Chung Chae-Heon
Ko Yeong-Mu
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Abstract
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The purpose of this study was to measure the color stability and water sorption of Dentacolor resin system at various time intervals over 6 week period.
Ten, 20 x 1mm discs of the resin specimen were prepared according to ADA specification No.27 and cured with a photo-polymerization equipment(Dentacolor XS and Unilux AC). The color parameters of L＊, a＊, b＊ were measured with a computerized colorimeter(Hunter Associates Laboratory Inc., USA) in the transmittance mode. The total color change(ΔE) occurred during two different time periods was calculated using the following equation: ??
The amount of water sorption measurements was done in accordance with ADA specification No.27 for one week in distilled water at 37 ±1℃ and then stored extended up to 6 weeks.
The obtained results were as follows :
l. At first week, total color difference(ΔE) value of Dentacolor resin system was 1.430 ±0.664.
2. It was found that the range of total color difference(ΔE) of Dentacolor resin system was between 0.5∼1.430 for 6 weeks.
3, The amount of water sorption for one week was 0.30 ±0.119mg/cm²and it was lower than the 0.7mg/cm²/week for type Ⅱ composites in ADA specification No.27.
4. The amount of water sorption of Dentacolor resin system after 6 weeks was much more than its amount of water sorption of the first week, but it was not significant difference(p>0.05).
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