Metameric effect between dental porcelain and porcelain repairing resin composite.
OBJECTIVE
The objectives were to evaluate the metameric color and hue angle (degrees) changes between dental porcelain and porcelain repairing resin composites.


METHODS
Color of three shades (A2, A3, A3.5) of one brand of dental porcelain and three original shades (A2, A3, A3.5) and three combinations (A2-A3, A3-3.5, A2-A3.5) of three brands of porcelain repairing resin composites (ABT, FSP, TCR) were measured relative to the three standard illuminants (D65, A and F2). Specimen was 2mm in thickness, and 1mm of each shade was layered to make combined shades. Color differences (DeltaEab*) between each shade of dental porcelain and repairing resin composites relative to the three illuminants were calculated, and the ratios of color difference (modified metamerism index) by the change of illuminant were calculated. The ratios of hue angle changes were also compared.


RESULTS
Differences in modified metamerism index and the ratio of hue angle changes were influenced by the porcelain shade, brand of resin composites and shade of resin composites. In all three brands of resin composites, A3.5 shade showed the smallest values in modified metamerism index regardless of the shade of porcelain. The average ratio of hue angle changes between each porcelain shade and all the shades of each resin composites showed similar trend when illuminant was changed from D65 to F2.


CONCLUSIONS
Metameric effect between dental porcelain and repairing resin composites varied depending on the shade of porcelain, brand of resin composite and the illuminant. Therefore, shade matching between porcelain and repairing resin composite should be performed carefully. This study confirmed that shades should be matched under the light corresponding to that of use.
Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea.
Sung-Hee
SH
Kim
Yong-Keun
YK
Lee
Bum-Soon
BS
Lim
Sang-Hoon
SH
Rhee
Hyeong-Cheol
HC
Yang
D000704:Analysis of Variance; D003116:Color; D003124:Colorimetry; D003188:Composite Resins; D003776:Dental Porcelain; D017269:Dental Prosthesis Repair; D008027:Light; D017797:Prosthesis Coloring
C425826:Arabesk; D003188:Composite Resins; C474035:Filtek Supreme; C121818:Tetric ceram; D003776:Dental Porcelain