R _{t} | Mean baseline roughness height | Mean post polishing roughness height | Mean difference R_{t} |
---|---|---|---|
Group 1 | 1.24 μm | 4.24 μm | 3.00 μm |
Group 2 | 1.28 μm | 4.24 μm | 2.96 μm |
Group 3 | 1.26 μm | 3.84 μm | 2.58 μm |
Group 4 | 1.28 μm | 5.36 μm | 4.08 μm |
p value | 0.925 | < 0.001 | < 0.001 |