Table 1.
Distribution of root and root canal morphology of mandibular premolars
| Classification | Left 1st PM | Right 1st PM | Left 2nd PM | Right 2nd PM | Overall | ||||
|---|---|---|---|---|---|---|---|---|---|
| n | % | n | % | n | % | n | % | n (%) | |
| 1 PM 1 | 262 | 40.62 | 264 | 40.93 | 278 | 47.52 | 283 | 48.38 | 1087 (88.37) |
| 2 PM 1 B 1 L 1 | 21 | 3.25 | 21 | 3.25 | 1 | 0.17 | 1 | 0.17 | 44 (3.5) |
| 2 PM B 1 L 1 | 3 | 0.46 | 3 | 0.46 | 2 | 0.34 | 8 (0.65) | ||
| 1 PM 1–2−1 | 18 | 2.79 | 16 | 2.49 | 2 | 0.34 | 2 | 0.34 | 38 (3.08) |
| 1 PM 1–2 | 18 | 2.79 | 16 | 2.49 | 3 | 0.51 | 2 | 0.34 | 39 (3.17) |
| 1 PM 1–2−1–2 | 1 | 0.15 | 2 | 0.32 | 3 (0.24) | ||||
| 3 PMMB 1 DB 1 L1 | 3 | 0.51 | 3 | 0.51 | 6 (0.48) | ||||
| C-Shaped canals | 3 | 0.51 | 2 | 0.34 | 5 (0.40) | ||||
| Total | 323 | 50.06 | 322 | 49.94 | 292 | 49.9 | 293 | 50.1 | 1230 (100) |
PM- premolars