Color Stability of the Bulk-Fill Composite Resins with Different Thickness in Response to Coffee/Water Immersion

Table 2

Mean (SD) of values at different time intervals and storage media.

Material (thickness)	Time interval	Storage media
		Water	Coffee
Conventional (2 mm)		2.1 (0.21)	2.86 (0.34)
		3.26 (0.22)	4.97 (0.54)
		4.41 (0.20)	8.11 (0.46)
		5.59 (0.26)	11.34 (0.56)
Bulk-fill (2 mm)		3.39 (0.36)	7.64 (0.58)
		4.03 (0.33)	11.26 (0.61)
		5.14 (0.24)	13.84 (0.75)
		7.57 (0.34)	17.02 (0.86)
Bulk-fill (4 mm)		3.12 (0.22)	8.00 (0.53)
		4.52 (0.24)	11.77 (0.44)
		5.61 (0.28)	17.11 (0.52)
		7.50 (0.35)	21.31 (0.40)

,   between 1 day and baseline; , between 7 days and baseline; , between 14 days and baseline; , between 28 days and baseline. Different lowercase letters indicate statistically significant differences between the media (). Different uppercase letters indicate statistically significant differences between materials ().