Table 2 Vertucci classification, additional root canal configurations, and C-shaped root canals in mandibular first and second premolars
Vertucci classification | Total | Mand. 1st PM | Mand. 2nd PM | |||
|---|---|---|---|---|---|---|
Vertucci, n (%) | C-shaped, n (%) | Vertucci, n (%) | C-shaped, n (%) | Vertucci, n (%) | C-shaped, n (%) | |
Type I (1) | 919 (79.3) | – | 392 (63.1) | – | 527 (98) | – |
Type II (2-1) | 10 (0.9) | – | 9 (1.4) | – | 1 (0.2) | – |
Type III (1-2-1) | 18 (1.6) | 7 (0.6) | 16 (2.6) | 6 (1) | 2 (0.4) | 1 (0.2) |
Type IV (2) | 4 (0.3) | – | 4 (0.6) | – | – | – |
Type V (1-2) | 185 (16) | 133 (11.5) | 177 (28.5) | 130 (20.9) | 8 (1.5) | 3 (0.6) |
Type VI (2-1-2) | 2 (0.2) | – | 2 (0.3) | – | – | – |
Type VII (1-2-1-2) | 1 (0.1) | – | 1 (0.2) | – | – | – |
Type VIII (3) | – | – | – | – | – | – |
Additional root canal configurations | ||||||
Trifurcation (1–3) | 20 (1.7) | 11 (0.9) | 20 (3.2) | 11 (1.8) | – | – |
Total | 1159 | 151 (13) | 621 | 147 (23.7) | 538 | 4 (0.7) |