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| etching type | grooved | abutment type | linear | uniform |
|---|---|---|---|---|
| roughness coefficient | 67.78 | 67.67 | 66.84 | 66.03 |
| centerline average (mm) | 40.08 | 12.35 | 11.66 | 11.94 |
| contour root mean square difference (mm) | 12.49 | 12.37 | 11.7 | 11.03 |
| maximum peak-to-peak-to-valley distance (mm) | 3.48 | 5.29 | 7.09 | 7.91 |
