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Effect of hydrogen peroxide on microhardness and color change of resin nanocomposites
Yong Hoon Kwon1, Dong-Hee Shin, Dong-In Yun
1Department of Dental Materials, School of Dentistry, Pusan National University, Yangsan 626-870, Korea. y0k0916@pusan.ac.kr
Purpose:
To examine the effect of hydrogen peroxide on the microhardness and color change of resin composites containing nanofillers.
Methods:
Three resin nanocomposites with three different shades and two different tooth whitening agents were used. The specimens were given a 3-week treatment with one of three protocols: (1) 7 hours/day treatment of carbamide peroxide (CP) + 17 hours/day immersion in distilled water (DW); (2) 1 hour/week treatment of hydrogen peroxide (HP) + immersion in DW for the rest of the week; and (3) immersion in DW for 24 hours/day. The microhardness and color changes were measured after treatment.
Results:
After treatment with the whitening agents, there was an 8.1-10.7% decrease in the original microhardness. These values were similar to those obtained from the samples treated with distilled water. In the same resin product, the decrease was similar regardless of the test agents used. In most cases, the color change was only slight (deltaE*=0.5-1.4). Hydrogen peroxide enhanced the color change but the absolute color change values were similar in the same product and shade, regardless of the test agent used.