Table 1. Ra surface roughness (µm) of the zirconia specimens (mean ± SD, n=5).

Groups	Ra
NC (control)	0.16 ± 0.02
WS (water-spray)	0.17 ± 0.02
AA (air-abrasion)	0.17 ± 0.02
IC (Ivoclean)	0.17 ± 0.01
SDS (sodium dodecyl sulfate)	0.17 ± 0.02
HP (H2O2)	0.17 ± 0.03
SHC (NaOCl)	0.16 ± 0.01

There were no significant differences among the test groups (one-way ANOVA, P=.683).