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The number of roots and different canal category in the maxillary second premolars [n, (%)]
| Root number | Canal category | |||||||
|---|---|---|---|---|---|---|---|---|
| Type I | Type II | Type III | Type IV | Type V | Type VI | Type VII | Type VIII | |
| One root | 616 (55.1) | 357 (31.9) | 6 (0.6) | 52 (4.7) | 16 (1.4) | 5 (0.4) | 1 (0.1) | 0 |
| Two roots | 0 | 0 | 0 | 62 (5.5) | 1 (0.1) | 0 | 0 | 2 (0.2) |
| Total | 616 (55.1) | 357 (31.9) | 6 (0.6) | 114 (10.2) | 17 (1.5) | 5 (0.4) | 1 (0.1) | 2 (0.2) |
