Research Article
Root Canal Anatomy of Maxillary First Premolar by Microscopic Computed Tomography in a Chinese Adolescent Subpopulation
Table 6
Distribution of root canal shape in the cross-sectional image of maxillary first premolars.
| | Group | Round | Oval | Long oval | Flat | Irregular shape | Total |
| | SR1C | | Coronal third | 0 | 0 | 21 (30%) | 35 (50%) | 14 (20%) | 70 | | Middle third | 0 | 28 (40%) | 21 (30%) | 7 (10%) | 14 (20%) | 70 | | Apical third | 14 (20%) | 28 (40%) | 21 (30%) | 0 | 7 (10%) | 70 | | Apical foremen | 35 (50%) | 21 (30%) | 7 (10%) | 0 | 7 (10%) | 70 |
| | SR2C | | Buccal canal | | Coronal third | 0 | 7 (10%) | 21 (30%) | 28 (40%) | 14 (20%) | 70 | | Middle third | 7 (10%) | 35 (50%) | 21 (30%) | 0 | 7 (10%) | 70 | | Apical third | 21 (30%) | 28 (40%) | 14 (20%) | 0 | 7 (10%) | 70 | | Apical foremen | 35 (50%) | 21 (30%) | 0 | 0 | 14 (20%) | 70 |
| | Palatal canal | | Coronal third | 0 | 7 (10%) | 21 (30%) | 28 (40%) | 14 (20%) | 70 | | Middle third | 0 | 35 (50%) | 28 (40%) | 7 (10%) | 0 | 70 | | Apical third | 7 (10%) | 21 (30%) | 14 (20%) | 7 (10%) | 21 (30%) | 70 | | Apical foremen | 35 (50%) | 28 (40%) | 0 | 0 | 7 (10%) | 70 |
| | 2R2C | | Buccal canal | | Coronal third | 0 | 0 | 7 (10%) | 42 (60%) | 21 (30%) | 70 | | Middle third | 0 | 28 (40%) | 7 (10%) | 0 | 35 (50%) | 70 | | Apical third | 7 (10%) | 21 (30%) | 7 (10%) | 0 | 35 (50%) | 70 | | Apical foremen | 35 (50%) | 7 (10%) | 0 | 0 | 28 (40%) | 70 |
| | Palatal canal | | Coronal third | 0 | 0 | 7 (10%) | 42 (60%) | 21 (30%) | 70 | | Middle third | 0 | 0 | 28 (40%) | 28 (40%) | 14 (20%) | 70 | | Apical third | 0 | 35 (50%) | 21 (30%) | 7 (10%) | 14 (20%) | 70 | | Apical foremen | 28 (40%) | 21 (30%) | 0 | 0 | 21 (30%) | 70 |
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