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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
  1. All numbers are asfc values