Table 1. Classification of groups depending on surface treatments.
| Group | Surface treatment | N |
|---|---|---|
| 1 | No treatment (Control) | 18 |
| 2 | Silane | 18 |
| 3 | H2O2 + Silane | 18 |
| 4 | H2O2 + Silane + Heat (80℃) | 18 |
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