Table 4.
Failure type analysis
| Samples | Adhesive failures | Cohesive failures | Mixed failures |
|---|---|---|---|
| Group 1 | 30 | - | - |
| Group 2 | 5 | 2 | 23 |
| Group 3 | 2 | 1 | 27 |
| Group 4 | 11 | - | 19 |
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