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Distribution of root canal types according to Vertucci's classification.
| Type | I | II | III | IV | V | VI | VII | VIII |
|---|---|---|---|---|---|---|---|---|
| First premolar n (%) | 355 (70.0) | 72 (14.2) | 11 (2.2) | 51 (10.1) | 14 (2.8) | 0 (0) | 2 (0.4) | 2 (0.4) |
| Second premolar n (%) | 449 (91.10) | 28 (5.7) | 1 (0.2) | 14 (2.8) | 0 (0) | 1 (0.2) | 0 (0) | 0 (0) |
