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http://dx.doi.org/10.14368/jdras.2015.31.4.294

Color evaluation of low viscosity bulk-fill resin with composite resin capping layer  

Yun, Jonghyeon (Department of Dental Science, School of Dentistry, Chonnam National University)
Jung, Ji-Hye (Department of Prosthodontics, College of Dentistry, Wonkwang University)
Chang, Hoon-Sang (Department of Conservative Dentistry, School of Dentistry, Chonnam National University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.31, no.4, 2015 , pp. 294-300 More about this Journal
Abstract
Purpose: The purpose of this study was to measure the color of low viscosity bulk-fill resin with a capping layer and to compare it with the color of microhybrid composite resin. Materials and Methods: A low viscosity bulk-fill resin (SDR) and microhybrid composite resin of shade A2 (A2) or A3 (A3) were fabricated to 4 mm thickness and light cured for 20 seconds. CIE $L^*a^*b^*$ values of the resin specimens were measured with a colorimeter. Then shade A2 and A3 microhybrid composite resin was capped over low viscosity bulk-fill resins in 2 mm thickness (SA2, SA3). The resin specimens were light cured for 20 seconds and the color was measured and analyzed (n = 10). Color differences (${\Delta}E$) between SA2 and A2, SA3 and A3 were also calculated. Results: $L^*$ value was highest in SDR followed by SA2 and SA3. $L^*$ value of A2 and A3 was the lowest. $a^*$ value was lowest in SDR followed by SA2 and SA3, and A2 and A3 was the highest. $b^*$ value was lowest in SDR followed by A2 and SA2, and A3 and SA3 was the highest. ${\Delta}E$ between A2 and SA2 (${\Delta}E=3.4$), and that between A3 and SA3 (${\Delta}E=3.1$) was lower than the perceptible color difference threshold of ${\Delta}E=3.7$. Conclusion: ${\Delta}E$ between low viscosity bulk-fill resin with a capping layer and microhybrid resin was lower than the perceptible color difference threshold.
Keywords
low viscosity bulk-fill resin; color; colorimeter;
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