Table 2.

Mean values ± standard deviation (SD) of color change (ΔE*)

Material	ΔE*
PMMA	1.49 ± 0.15 A
PMMA + gel 1 with citrate	2.6 ± 0.09 B
PMMA + gel 2 with PVP	3.6 ± 0.12 C
PMMA + Curasept 0.5%	2.4 ± 0.10 D
PMMA + Curasept 1%	3.67 ± 0.06 E

* Capital letters in columns denote statistically significant differences with p ≤ 0.05.