Table 4.

Mean, range, standard deviation, and P value of surface roughness in micrometer (posttest)

Group	Mean±SD	Minimum-Maximum	P
Dash (B1)	0.378±0.082	0.270-0.500	0.657*
Pola Office (B2)	0.354±0.078	0.240-0.470
Opalescence Boost (B3)	0.347±0.075	0.230-0.450

*Nonsignificant. SD: Standard deviation