Effect of Laser and Conventional Office Bleaching and Polishing on the Color Change of Stained Nanohybrid and Microhybrid Composite Resin

Table 2

Mean color change of two composite resins after immersion in coffee solution (ΔE₁).

Composite resin	Method	Mean ± SD	Maximum	Minimum
Clearfil	Polishing	5.33 ± 1.17	7.04	3.49
	Office bleaching	5.98 ± 1.3	7.97	4.03
	Laser bleaching	5.35 ± 1.97	8.38	3.3
Grandio	Polishing	6.05 ± 1.88	8.32	2.82
	Office bleaching	6.51 ± 2.11	9.4	3.73
	Laser bleaching	6.52 ± 1.66	8.47	4.46