Table 2.
Means (SD) roughness differences relative to the baseline readings
| Material | Group | 1st day | 3rd day | 28th day | |||
|---|---|---|---|---|---|---|---|
| NT | Water (C) | -0.01±0.17 | 0.27±0.27 | * | 0.19±0.20 | * | |
| Perborate (P) | 0.32±0.19 | * | 0.32±0.11 | * | 0.42±0.14 | * | |
| Microwave (MW) | 0.52±0.13 | * | 0.56±0.12 | * | 0.76±0.22 | * | |
| TR | Water (C) | 0.02±0.23 | 0.06±0.30 | 0.03±0.31 | |||
| Perborate (P) | 0.06±0.21 | 0.13±0.34 | 0.24±0.33 | ||||
| Microwave (MW) | 0.13±0.24 | 0.07±0.13 | 0.14±0.28 | ||||
| UH | Water (C) | 0.26±0.32 | * | 0.21±0.27 | * | 0.19±0.20 | * |
| Perborate (P) | -0.02±0.20 | 0.11±0.14 | * | 0.25±0.26 | * | ||
| Microwave (MW) | 0.17±0.07 | * | 0.18±0.12 | * | 0.14±0.13 | * | |
| L | Water (C) | 0.08±0.12 | 0.03±0.12 | 0.08±0.12 | |||
| Perborate (P) | 0.08±0.08 | 0.04±0.06 | 0.09±0.12 | ||||
| Microwave (MW) | 0.08±0.22 | 0.00±0.21 | 0.07±0.18 | ||||
| S | Water (C) | -0.01±0.07 | -0.04±0.20 | -0.10±0.16 | |||
| Perborate (P) | 0.02±0.05 | 0.03±0.17 | 0.06±0.31 | ||||
| Microwave (MW) | 0.00±0.11 | -0.07±0.22 | 0.00±0.21 | ||||
| D | Water (C) | -0.07±0.21 | 0.06±0.25 | 0.10±0.29 | |||
| Perborate (P) | -0.10±0.25 | -0.08±0.24 | -0.11±0.28 | ||||
| Microwave (MW) | 0.20±0.35 | 0.19±0.37 | 0.14±0.37 | ||||
| T | Water (C) | -0.67±0.68 | * | -0.86±0.65 | * | -0.75±0.46 | * |
| Perborate (P) | 0.10±0.40 | 0.08±0.54 | -0.43±0.44 | * |
*
Statistical difference between the roughness measurements obtained at three evaluation periods (1, 3 and 28 days) and the baseline readings (t-Student test; P < .05).