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Effect of staining solutions on discoloration of resin nanocomposites
Jeong-Kil Park1, Tae-Hyong Kim, Ching-Chang Ko
1Department of Conservative Dentistry, School of Dentistry and Medical Research Institute, Pusan National University, Yangsan, Korea.
Purpose:
To examine the effect of staining solutions on the discoloration of resin nanocomposites.
Methods:
Three resin nanocomposites (Ceram X, Grandio, and Filtek Z350) were light cured for 40 seconds at a light intensity of 1000 mW/cm2. The color of the specimens was measured in %R (reflectance) mode before and after immersing the specimens in four different test solutions [distilled water (DW), coffee (CF), 50% ethanol (50ET) and brewed green tea (GT)] for 7 hours/day over a 3-week period. The color difference (deltaE*) was obtained based on the CIEL*a*b* color coordinate values.
Results:
The specimens immersed in DW, 50ET and GT showed a slight increase in L* value. However, the samples immersed in CF showed a decrease in the L* value and an increase in the b* value. CF induced a significant color change (deltaE*: 3.1-5.6) in most specimens but the other solutions induced only a slight color change. Overall, coffee caused unacceptable color changes to the resin nanocomposites.
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