L⁄, a⁄, and b⁄ parameters were measured and compared for both
the on and off-line procedures to correlate the reflectance spectra
to the colour modification (Table 1). The on-line analysis revealed
that a⁄ value, related to redness, was reduced during the treatment,
while L⁄ and b⁄ increase from 5 min to 60 min, proving an increment
in brilliance and yellowness of the sample. The off-line measurements
of colour parameters showed a similar behaviour.
L⁄, a⁄, and b⁄ parameters were measured and compared for boththe on and off-line procedures to correlate the reflectance spectrato the colour modification (Table 1). The on-line analysis revealedthat a⁄ value, related to redness, was reduced during the treatment,while L⁄ and b⁄ increase from 5 min to 60 min, proving an incrementin brilliance and yellowness of the sample. The off-line measurementsof colour parameters showed a similar behaviour.
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