Table 3. Classification of mandibular first and second premolars according to numbers of roots and canals per root.
| Type | Mandibular 1. Premolar | Mandibular 2. Premolar | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Single rooted
|
Single rooted
|
|||||||||
|
Right
|
Left
|
Total |
Right
|
Left
|
Total | |||||
| F (%) | M (%) | F (%) | M (%) | F (%) | M (%) | F (%) | M (%) | |||
| One canal at apex | — | — | — | — | — | — | — | — | — | — |
| Type I | 131 (25.8) | 99 (19.5) | 126 (24.9) | 97 (19.1) | 453 (89.5) | 113 (25.2) | 100 (22.3) | 119 (26.5) | 101 (22.5) | 433 (96.6) |
| Type II | — | — | 2(0.3) | — | 2 (0.3) | — | 1 (0.2) | 1 (0.2) | 3 (0.6) | 5 (1.1) |
| Type III | — | 6 (1.1) | 3 (0.5) | 9 (1.7) | 18 (3.5) | 1 (0.2) | 1 (0.2) | 3 (0.6) | — | 5 (1.1) |
|
Two canals at apex
| ||||||||||
| Type IV | 1 (0.1) | — | 1 (0.1) | — | 2 (0.3) | — | — | — | — | — |
| Type V | 5 (0.9) | 11 (2.1) | 4 (0.7) | 11 (2.1) | 31 (6.1) | 1 (0.2) | 2 (0.4) | — | 2 (0.4) | 5 (1.1) |
| Type VI | — | — | — | — | — | — | — | — | — | — |
| Three canals at apex | — | — | — | — | — | — | — | — | — | — |
Abbreviations: F, female; M, male.