Color analysis
For color evaluation, the fragments were placed on a standard white background in
a standardized light chamber (Optical Light Cabin Model CL6I-45S, T&M
Instruments, São Paulo, Brazil) with a D65 illuminant that simulates the
spectrum of daylight. The spectrophotometer (Easyshade, VITA, Bad Säckingen,
Germany) was periodically calibrated. After the treatments, new color readouts
were performed.The color change (ΔE
Where ΔL', ΔC', and ΔH' were the differences in lightness, chroma, and hue
between two specimens and RThe variation of WI
The ΔWI