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Canal configuration and the type of root canal in mandibular first molars.
| Group (no. of roots) | Canal configuration (type) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| I | II | III | IV | V | VI | VII | VIII | 2-1-2-1 | |
| Mesial root (150) | — | 55 | — | 81 | 1 | 12 | — | — | 1 |
| 36.6% | 54% | 0.6% | 8% | 0.6% | |||||
| Distal root (150) | 98 | 31 | 2 | 14 | 5 | — | — | — | — |
| 65.3% | 20.6% | 1.3% | 9.3% | 3.3% | |||||
| Distolingual root (8) | 8 | — | — | — | — | — | — | — | — |
| 100% | |||||||||
Canal configurations were categorized using Vertucci's classification (1984) [7].
