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Table 7 Post-hoc tests for Rz (mean roughness depth)

From: Comparative evaluation of enamel surface roughness after debonding using four finishing and polishing systems for residual resin removal—an in vitro study

Dependent variable Comparison group Compared with Mean difference (unit-μm) Std. error p value
Baseline Rz Group 1 Group 2 0.07 0.09 0.824
Group 3 − 0.01 0.09 1
Group 4 0.06 0.09 0.903
Group 2 Group 3 − 0.08 0.09 0.765
Group 4 − 0.01 0.09 0.998
Group 3 Group 4 0.07 0.09 0.857
Post polishing Rz Group 1 Group 2 − 0.20 0.17 0.633
Group 3 0.23 0.17 0.527
Group 4 − 2.73* 0.17 < 0.001
Group 2 Group 3 0.44 0.17 0.059
Group 4 − 2.53* 0.17 < 0.001
Group 3 Group 4 − 2.97* 0.17 < 0.001
Difference in Rz Group 1 Group 2 − 0.28 0.17 0.384
Group 3 0.24 0.17 0.515
Group 4 − 2.80* 0.17 < 0.001
Group 2 Group 3 .53* 0.17 0.019
Group 4 − 2.51* 0.17 < 0.001
Group 3 Group 4 − 3.04* 0.17 < 0.001
  1. Rz, mean roughness depth, μm micrometer, p value probability value, *statistical significance