. 2018 Apr 18;10(2):132–137. doi: 10.4047/jap.2018.10.2.132

Table 2. Mean and standard deviations of surface roughness values (um).

Group	N	Mean (SD)
Control	20	1.11 (0.27)^a
G	20	1.77 (0.26)^b
M	20	0.28 (0.11)^c
E	20	0.28 (0.07)^c
P	20	0.78 (0.14)^d

Same letters indicates the values that were not statistically different (P > .05).

SD: Standard deviation, Control: Sintered zirconia, Group G: Grinding, Group M: Meisinger polishing systems, Group E: EVE Diacera polishing systems, Group P: EVE Diapol polishing systems