Table 2 Influence of the etching time on the roughness of the enamel surface
From: Enamel surface alterations after repeated conditioning with HCl
Conditioning time | controls | 2 min | 2×2 min | 2×3 min | 2×4 min |
|---|---|---|---|---|---|
Mean | 3.26 | 3.49 | 2.83 | 2.99 | 3.64 |
Standard deviation | 0.72 | 1.41 | 1.87 | 1.72 | 1.42 |
Median | 3.14 | 3.22 | 2.91 | 3.88 | 3.46 |
Minimum | 2.03 | 1.37 | 0.41 | 1.37 | 2.18 |
Maximum | 4.49 | 6.39 | 6.86 | 6.81 | 6.88 |
25 % percentile | 2.67 | 2.70 | 1.10 | 2.00 | 2.54 |
75 % percentile | 3.68 | 4.65 | 4.21 | 5.31 | 4.42 |