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| Clinical control and experimental conditions and treatments | Number of roots |
|---|---|
| Healthy tooth (control) | 10 roots |
| Tooth with untreated periapical lesion (control) | 10 roots |
| Tooth treated endodontically in a single session (control) | 10 roots |
| Tooth treated endodontically in two sessions: paste based on EGCG (experimental) | 20 roots |
| Tooth treated endodontically in two sessions: paste based on calcium hydroxide (experimental) | 20 roots |
