Table 2.
Number and frequency of the number of roots and number of root canals in mandibular first molars by position and sex
| Left | Subtotal, n (%) | Right | Subtotal, n (%) | Total, n (%) | |||
|---|---|---|---|---|---|---|---|
| Male (n) | Female (n) | Male (n) | Female (n) | ||||
| Mandibular first molars | |||||||
| Single root | - | - | - | - | - | - | - |
| Two separate roots | 84 | 66 | 150 (90.4) | 78 | 63 | 141 (84.9) | 291 (87.7) |
| Three separate roots | 10 | 6 | 16 (9.6) | 16 | 9 | 25 (15.1) | 41 (12.3) |
| Number of root canals | |||||||
| 2 canals | 1 | 8 | 9 (5.4) | 0 | 6 | 6 (3.6) | 15 (4.5) |
| 3 canals | 69 | 44 | 113 (68.1) | 66 | 42 | 108 (65.1) | 221 (66.6)* |
| 4 canals | 24 | 20 | 44 (26.5) | 28 | 24 | 52 (31.3) | 96 (28.9) |
| Mandibular first molars with four root canals | |||||||
| Two separate roots | 15 | 14 | 29 (65.9) | 12 | 16 | 28 (53.8) | 57 (59.4) |
| Three separate roots | 9 | 6 | 15 (34.1) | 16 | 8 | 24 (46.2) | 39 (40.6) |
*Mandibular first molars with three canals were two-third of the sample