Table 1: Scoring system.
| Residue observation | Score |
| Clean root canal wall, only few small debris particles | 1 |
| Few small agglomerations of CH | 2 |
| Less than 50% | 3 |
| More than 50% | 4 |
| Complete or nearly complete root canal wall covered | 5 |
Score 1: Clean root canal wall, only few small debris particles; Score 2: Few small agglomerations of debris; Score 3: Many agglomerations of debris covering less than 50% of the root canal wall; Score 4: More than 50% of the root canal wall covered by debris; Score 5: Complete or nearly complete root canal wall covered by debris.