Table 3: Chromatic evaluation pre and post bleaching ( Mean values, standard deviation, mean differences, P. value).

CHROMATICA SCALE VALUE ΔE SPECTROPHOTOMETER
LED LAMP
PHOTO ACTIVATION
LASER PHOTOATIVATION LED LAMP PHOTO ACTIVATION LASER PHOTO ACTIVATION
Pre-bleaching Post bleaching Pre bleaching Pre-bleaching Post-bleaching Pre-bleaching Post-bleaching Post-bleaching
Mean 6.22 10.33 6 10.88 6 10,5 5,7 11
STD,ERROR 1,64 2,64 2,17 2,31 1,56 2,72 2,04 2,42
DIFFERENCE 4,11 4,88 4,5 5,3
PVALUE 0,00059 0,00014 0,0006 0,00017

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