Table 2 Cross-sectional root canal shape of maxillary single-rooted 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 5 | Type 1 | Type 5 | Type 1 | Type 5 | ||||||||
1st premolar | 470 | – | 70 | 23.3 | 6.7 | – | 70 | – | 30 | – | 70 | – | 30 |
2nd premolar | 659 | 7.7 | 79.4 | 3.3 | 9.6 | 7.7 | 79.7 | – | 12.6 | 7.7 | 62.1 | 4.1 | 26.2 |
