Table 3. Results of two-way ANOVA test.

Variable (source)	Sum of squares	df	Mean squares	F	P
Resin matrix ceramic	13,095	2	6,548	1,900	.156
Surface treatment	335,843	2	167,921	48,725	.000
Interaction	29,716	4	7,429	2,156	.081
Error	279,152	81	3,446
Total	26,562,512	90

^*Significantly different at P < .05.