. 2020 Feb 20;12(1):22–32. doi: 10.4047/jap.2020.12.1.22

Table 6. Mean and standard deviation of surface roughness (Ra ± SD) values of CAD/CAM indirect restoratives with different surface treatments.

Surface Treatment	CAD/CAM Indirect Restoratives
Surface Treatment	FHC	RNC	PICN	FC
Control	0.56 ± 0.08 ^{A, a}	0.62 ± 0.07 ^{A, a}	0.51 ± 0.10 ^{A, a}	0.56 ± 0.04 ^{A, a}
HF	1.20 ± 0.08 ^{A, b}	1.18 ± 0.08 ^{AB, b}	1.01 ± 0.14 ^{B, bc}	1.14 ± 0.12 ^{A, b}
AlO	1.47 ± 0.08 ^{A, c}	1.55 ± 0.08 ^{A, c}	1.13 ± 0.09 ^{B, c}	0.94 ± 0.13 ^{C, c}
TSC	1.61 ± 0.07 ^{A, c}	1.69 ± 0.16 ^{A, c}	0.88 ± 0.13 ^{B, b}	0.90 ± 0.09 ^{B, c}

Mean values represented with same superscript uppercase letters (row) or lowercase letters (column) are not significant according to Tukey test (P > .05).