Table 1. Classification of maxillary first premolars according to numbers of roots and canals per root.
| Maxillary 1. Premolar |
Single root
|
Two rooted
|
Three rooted
|
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type |
Right
|
Left
|
Total (%) |
Right
|
Left
|
Total (%) |
Right
|
Left
|
Total (%) | ||||||
| F (%) | M (%) | F (%) | M (%) | F (%) | M (%) | F (%) | M (%) | F (%) | M (%) | F (%) | M (%) | ||||
|
One canal at apex
| |||||||||||||||
| Type I | 5 (1.1) | 5 (1.1) | 5 (1.1) | 5 (1.1) | 20 (4.5) | — | — | — | — | — | — | — | — | — | — |
| Type II | 27 (6.1) | 10 (2.2) | 26 (5.9) | 8 (1.8) | 71 (16.2) | — | — | — | — | — | — | — | — | — | — |
| Type III | — | 1 (0.2) | — | 1 (0.2) | 2 (0.4) | — | — | — | — | — | — | — | — | — | — |
|
Two canals at apex
| |||||||||||||||
| Type IV | 31 (7) | 38 (8.6) | 31 (7) | 40 (9.1) | 140 (32) | 53 (12.1) | 46 (10.5) | 48 (10.9) | 49 (11.2) | 196 (44.8) | — | — | — | — | — |
| Type V | 2 (0.4) | — | — | 1 (0.2) | 3 (0.6) | — | — | — | — | — | — | — | — | — | — |
| Type VI | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Three canals at apex | — | — | — | — | — | — | — | — | — | — | — | 2 (0.4) | — | 2 (0.4) | 4 (0.9) |
Abbreviations: F, female; M, male.