Table 3.

Means, SD, and SE of the change in surface roughness (Δ Ra) for each type of dental resin composite after being subjected to different beverages used in the study with/without brushing regarding the effect of different beverages

Material	Group	Beverages	Mean	SD	SE	p-value
Admira fusion	Non-Brushing	Artificial saliva (control)	.004c	.002	.001	0.00*
		Nescafe Classic	.005c	.002	.001
		Red wine	.014b	.003	.001
		Pepsi Cola	.020a	.002	.001
	Brushing	Artificial saliva (control)	.009d	.001	.001	0.00*
		Nescafe Classic	.016c	.001	.000
		Red wine	.029b	.001	.001
		Pepsi Cola	.065a	.003	.001
Grandio	Non-Brushing	Artificial saliva (control)	.005a	.001	.000	0.187 ns
		Nescafe Classic	.004a	.001	.000
		Red wine	.004a	.001	.000
		Pepsi Cola	.003a	.001	.001
	Brushing	Artificial saliva (control)	.008c	.001	.001	0.00*
		Nescafe Classic	.020b	.003	.001
		Red wine	.019b	.003	.001
		Pepsi Cola	.024a	.001	.001

Significance level P < 0.05, *significant

Tukey’s post hoc test: means sharing the same superscript letters are not significantly different