Influence of background color on the color changes of resin composites after accelerated aging.
OBJECTIVE
To evaluate the changes in color and color coordinates after accelerated aging of resin composites depending on the background color.


METHODS
Color of seven resin composites (14 shades, 1 mm-thick) was measured in the reflectance mode over a zero calibration box, a white background, and a black background. After baseline color measurement, specimens were aged for total energy of 150 kJ/m2. Color change after aging was calculated over three backgrounds. Based on the data of A2 shade composites, the influence of the background color on the changes in color (deltaE*ab) and changes in three color coordinates (deltaL*, deltaa* and deltab*) after aging was analyzed by ANOVA (P < 0.01). Correlation among the color changes over three backgrounds was determined with a linear regression analysis.


RESULTS
Background color influenced deltaE*ab, deltaL*, deltaa* and deltab* values. There were significant correlations among the color changes over three backgrounds in the reflectance mode (r = 0.95-0.98).
Lee
Yong-Keun
YK
Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea. ykleedm@snu.ac.kr
Powers
John M
JM
D003116:Color; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D006801:Humans; D006813:Humidity; D008027:Light; D008422:Materials Testing; D055095:Optics and Photonics; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
D003188:Composite Resins; C507124:Estelite sigma; C466112:Esthet-X; C474035:Filtek Supreme; C467914:TPH spectrum; C121818:Tetric ceram; C086113:palfique estelite