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| Methods | N | % |
| Glutaraldehyde | 7 | 7.78 |
| NaOCl 1% | 2 | 2.22 |
| 70% alcohol | 28 | 31.11 |
| Nothing | 4 | 4.44 |
| Chlorhexidine 0,12% | 4 | 4.44 |
| Others | 32 | 35.56 |
| Associations | 13 | 14.44 |
