Effects of 16% Carbamide Peroxide Bleaching on the Surface Properties of Glazed Glassy Matrix Ceramics

Table 4

Two-way analysis of variance for surface roughness testing.

Source	Type III sum of squares	df	Mean square	F
Ceramic	0,241	1	0,241	5,699	0,025
Surface treatment	2,041	1	2,041	48,179	<0,001
Ceramic  surface treatment	0,010	1	0,010	0,246	0,625

represents significant difference.