Analysis of Physical and Mechanical Properties of Universal Composites under Different Types of Polishing before and after Acid Challenge

Table 3

Mean values (standard deviation) of roughness (Ra—µm) of Z350 XT composite resins specimens, according to polishing and challenge types.

Groups	Challenges	Initial	After polishing	After challenges
		T0	T1	T2
Control	Saliva	0.07 (0.03) Aa	0.07 (0.03) Aa	0.07 (0.02) Aa
	HCl	0.06 (0.01) Aa	0.06 (0.01) Aa	0.08 (0.01) Aa
Wear	Saliva	0.07 (0.02) Aa	2.02 (0.58) Bb	1.65 (0.43) Bb
	HCl	0.07 (0.02) Aa	2.15 (0.50) Bb	2.40 (0.66) Cb
Biscover	Saliva	0.08 (0.01) Aa	0.08 (0.03) Aa	0.10 (0.05) Aa
	HCl	0.08 (0.02) Aa	0.07 (0.02) Aa	0.09 (0.02) Aa
Cosmedent	Saliva	0.07 (0.02) Aa	0.09 (0.04) Aa	0.08 (0.02) Aa
	HCl	0.07 (0.01) Aa	0.12 (0.02) Aa	0.11 (0.01) Aa

Note: Means followed by the same capital letter in the column and lowercase in the row do not differ at 5% significance level () by Tukey’s test.