Table 5 Cross-sectional root canal shape of mandibular premolar teeth.
Tooth | Number of teeth | Coronal third % | Middle third % | Apical third % | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Round | Oval | Ribbon like | Round | Oval | Ribbon like | Round | Oval | Ribbon like | ||||||||
Type 1 | Type 3 | Type 5 | Type 1 | Type 3 | Type 5 | Type 1 | Type 3 | Type 5 | ||||||||
1st premolar | 600 | 4.8 | 95.2 | – | – | – | 44.7 | 48.6 | 4.9 | – | 1.8 | 44.7 | 48.6 | 4.9 | – | 1.8 |
2nd premolar | 520 | 66.8 | 32.9 | 0.3 | – | – | 66.8 | 26.6 | 2.8 | 0.3 | 3.4 | 84.9 | 8.5 | 2.8 | 0.3 | 3.4 |
