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| etching type | grooved | abutment type | linear | uniform |
|---|---|---|---|---|
| roughness coefficient | 67.78 | 66.83 | 67.93 | 66.94 |
| centerline average (mm) | 40.08 | 11.65 | 40.28 | 11.70 |
| contour root-mean-square difference (mm) | 12.49 | 11.67 | 12.60 | 11.74 |
| maximum peak-to-peak-to-valley distance (mm) | 3.32 | 5.29 | 5.65 | 7.65 |
| fracture conductivity (D·cm) | 199.87 | 157.26 | 134.01 | 126.83 |
