Yong-Keun Lee1, John M Powers. 1. Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea. ykleedm@snu.ac.kr
Abstract
PURPOSE: 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).
PURPOSE: 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).
Authors: María M Pérez; Cristina Benavides-Reyes; Maria Tejada-Casado; Javier Ruiz-López; Cristina Lucena Journal: Materials (Basel) Date: 2022-05-22 Impact factor: 3.748