Table 1. Root canal configuration of the maxillary second molar observed under micro-computed tomography (n=123).
| Root canal configuration of the maxillary second molar | |||
|---|---|---|---|
| Frequency |
|||
| Root | Configuration | Absolute | Mean |
| MB (MB1 and MB2) | 1-1-1/1 | 32 | 26.0 |
| 2-2-2/2 | 24 | 19.5 | |
| 2-2-1/1 | 18 | 14.6 | |
| 2-1-1/1 | 16 | 13.0 | |
| 2-1-2/2 | 10 | 8.1 | |
| 1-1-2/2 | 9 | 7.3 | |
| 1-2-2/2 | 5 | 4.1 | |
| 1-1-1/2 | 2 | 1.6 | |
| 1-2-1/1 | 1 | 0.8 | |
| 1-2-3/3 | 1 | 0.8 | |
| 1-3-2/2 | 1 | 0.8 | |
| 2-1-1/2 | 1 | 0.8 | |
| 2-2-1/2 | 1 | 0.8 | |
| 2-2-3/3 | 1 | 0.8 | |
| 3-3-3/3 | 1 | 0.8 | |
| DB | 1-1-1/1 | 115 | 93.5 |
| 1-1-1/2 | 2 | 1.6 | |
| 1-1-2/2 | 2 | 1.6 | |
| 1-2-2/2 | 2 | 1.6 | |
| 1-2-1/1 | 1 | 0.8 | |
| 3-1-1/1 | 1 | 0.8 | |
| P | 1-1-1/1 | 119 | 96.7 |
| 1-1-1/2 | 3 | 2.4 | |
| 1-1-2/2 | 1 | 0.8 | |
DB, distobuccal; MB, mesiobuccal; P, palatal.
The MB root depicts the results of the MB1 and MB2 root canals together. The configuration numbers from left to right describe the root canal path from the coronal, middle and apical thirds, respectively (13). The last number, separated with a slash, shows the number of main foramina observed.