Color Matching of Universal Shade Resin-Based Composite with Natural Teeth and Its Stability before and after In-Office Bleaching

Table 4

Color difference in L, a, and b at after bleaching and 2 weeks after bleaching measurements.

Treatment stage	L	a	b
	Mean ± (SD)
Postbleaching	87.330 ± (4.428)	0.864 ± (0.681)	22.392 ± (2.845)
2 weeks postbleaching	81.954 ± (6.060)	0.902 ± (0.603)	20.795 ± (3.286)	ΔE00
Δ	−5.376 ± (1.632)	0.038 ± (0.078)	−1.597 ± (0.441)	3.651
-value	0.000	0.792	0.022

indicates a significant difference between postbleaching and 2 weeks postbleaching values.