Table 3.

Results of Roughness test and statistical significance between Groups.

	Ra values
Group	N	Mean	sd	Median	25%–75%
Fuji IX	16	4,69	(6,81)	2.57	0.22–6.28
Fuji IX / G-Coat Plus	13	2,00	(2,94)	0.95	0.62–1.61
Vitremer	15	1,71	(1,23)	1.38	0.68–2.54
Vitremer / Finishing Gloss	10	0,87	(0,66)	0.64	0.39–1.29