Table 1.

Means (standard deviations) for ΔE values (2-way ANOVA, Bonferroni's test; p<0.05)

	Z250	Z350
Control	1.52 (0.37)a,A	0.96 (0.24)b,AB
Listerine	0.99 (0.29)a,B	1.25 (0.24)a,AC
Plax Classic	1.32 (0.46)a,AB	0.64 (0.23)b,B
Plax alchohol-free	1.42 (0.45)a,A	1.46 (0.30)a,C
Periogard	1.40 (0.71)a,A	0.93 (0.16)b,AB

Different lowercase letters in lines and uppercase letters in columns indicate statistically significant difference.