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http://dx.doi.org/10.5395/JKACD.2011.36.4.324

Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength  

Yoo, Ji-A (Department of Dentistry, Seoul National University School of Dentistry)
Cho, Byeong-Hoon (Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute)
Publication Information
Restorative Dentistry and Endodontics / v.36, no.4, 2011 , pp. 324-335 More about this Journal
Abstract
Objectives: This study investigated the effects of the color components of light-cured composite resin before and after polymerization on degree of conversion (DC) and biaxial flexural strength (FS). Materials and Methods: Four enamel shades (A1, A2, A3, A4) and two dentin shades (A2O, A3O) of Premisa (Kerr Co.) and Denfil (Vericom Co.) were evaluated on their CIE $L^*,\;a^*,\;b^*$ color components using the spectrophotometer before curing, after curing and at 7 day. The DC of same specimens were measured with Near-infrared spectrometer (Nexus, Thermo Nicolet Co.) at 2 hr after cure and at 7 day. Finally, the FS was obtained after all the other measurements were completed at 7 day. The correlations between each color component and DC and FS were evaluated. Results: The light-curing of composite resin resulted in color changes of Premisa in red-blue direction and Denfil in green-blue direction. The DC and FS were affected by product, time and shade (3-way ANOVA, p < 0.05) and product and shade (2-way ANOVA, p < 0.05), respectively. Premisa only showed a significant correlation between the DC and CIE $a^*$ component - before and after polymerization (Pearson product moment correlation, p < 0.05). The FS of Premisa showed significant negative correlations with CIE $a^*$ and CIE $b^*$ components. Conclusions: The DC and FS of the light-curing composite resin were affected by the color components of the material before and after polymerization.
Keywords
Biaxial flexural strength; CIE $Lab^*$; Degree of conversion; Light-cured composite resin; Shade;
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Times Cited By KSCI : 3  (Citation Analysis)
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