Table 7.

Average values (computed over the four procedures) and standard deviation of roughness Ra measured in the experi-mental tests. Statistical comparisons (Tukey post-hoc test, Control Group A) are shown in the last column.

	A [mm]	B [mm]	C [mm]	D [mm]	Comparison vs A
mean	1.253	0.533	0.955	0.513	B, D
Std dev	0.535	0.401	0.449	0.316