. 2020 Feb 22;13(4):981. doi: 10.3390/ma13040981

Table 2.

Means and standard deviations of S_a (μm) and S_z (μm) with respect to material and surface treatment. The same lowercase superscripts in columns indicate no statistically significant difference (p > 0.05).

Sources		Group Size (n)	Dependent Variables
Material	Surface Treatment		S_a		S_z
Material	Surface Treatment		Mean	Standard Deviation	Mean	Standard Deviation
	INT	8	0.192^a	0.005	1.712^a	0.435
SH	SB	8	0.225^b	0.002	6.037^b	0.709
	HF + Si	8	0.222^b,c	0.005	4.587^c	0.699
	CJ	7	0.218^c	0.003	6.842^b	0.229
	INT	8	0.182^d	0.007	1.000^d	0.292
LV	SB	8	0.219^c	0.004	5.787^b	0.825
	HF + Si	7	0.228^e	0.001	2.171^e	0.423
	CJ	7	0.222^c	0.003	5.485^b	0.625
	INT	8	0.184^a,d	0.009	0.475^f	0.158
BR	SB	8	0.228^e	0.003	5.925^b	1.188
	HF + Si	8	0.227^e	0.001	1.287^e	0.699
	CJ	8	0.227^e	0.002	5.275^b	0.837
	INT	7	0.196^a	0.001	2.885^f	0.705
EN	SB	6	0.222^c,b	0.005	6.300^b	0.363
	HF + Si	8	0.217^c	0.003	5.900^b	0.607
	CJ	7	0.225^b	0.003	5.742^b	0.113

SH: Shofu Block HC, LV: Lava Ultimate, BR: Brilliant Crios, EN: Vita Enamic, INT: intact, SB: sandblasting, HF + Si: hydrofluoric acid and silane, CJ: Cojet system.