Changes in color and translucency of porcelain-repairing resin composites after thermocycling.
The objective of this study was to determine the changes in color and translucency of dental porcelain-repairing resin composites compared to dental porcelain after thermocycling. Color and spectral reflectance of three shades (A2, A3, and A3.5) of one brand of dental porcelain and three basic shades (A2, A3, and A3.5) and three combinations (A2/A3, A3/3.5, and A2/A3.5) of three brands of porcelain-repairing resin composites (ABT, FSP, and TCR) were measured, before and after thermocycling for 3000 cycles, relative to the illuminant D65. The specimen was 2 mm in thickness, and 1 mm of each shade was layered to make combined shades. Changes in color (DeltaE*ab) and translucency parameter (DeltaTP) were calculated. A general linear model by the material (porcelain or resin composite) and shade was used to compare differences (alpha = 0.05). The range of color changes was 0.68-1.67 in porcelain, 0.56-1.30 in ABT, 2.28-3.10 in FSP, and 0.36-1.15 in TCR. The range of DeltaTP was 0.45-0.96 in porcelain, -0.48 to 0.94 in ABT, -1.31 to 0.82 in FSP, and -0.51 to 1.91 in TCR. After thermocycling, changes in color and TP were correlated with the shade of the material, but not with the material. The discrepancy in the changes of color and translucency after thermocycling between porcelain and porcelain-repairing resin composites should be considered when selecting repairing materials.
Choi
Mi-Sook
MS
Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea.
Lee
Yong-Keun
YK
Lim
Bum-Soon
BS
Rhee
Sang-Hoon
SH
Yang
Hyeong-Cheol
HC
Lim
Young-Jun
YJ
D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D006358:Hot Temperature; D008422:Materials Testing
D003188:Composite Resins; D003776:Dental Porcelain