Table 4. Physiological foramen shape frequency (%) of first and second maxillary and mandibular molars.
| 1st MX | M (S) | MB (2) | MB (3) | DB (S) | DB (2) | P (S) |
|---|---|---|---|---|---|---|
| Oval | 64.4 | 69.4 | 44.4 | 67.8 | 75.0 | 70.9 |
| Round | 25.7 | 23.9 | 44.4 | 18.1 | 25.0 | 20.1 |
| Irregular | 9.9 | 6.7 | 11.2 | 14.1 | 0.0 | 9.0 |
| n | 109 | 134 | 9 | 177 | 4 | 179 |
| 2nd MX | M (S) | MB (2) | MB (3) | DB (S) | DB (2) | P (S) |
| Oval | 77.6 | 75.5 | 66.7 | 68.4 | 100.0 | 73.1 |
| Round | 11.9 | 13.2 | 22.2 | 23.1 | 0.0 | 20.2 |
| Irregular | 10.5 | 11.3 | 11.1 | 8.5 | 0.0 | 6.7 |
| n | 67 | 106 | 9 | 117 | 6 | 119 |
| 1st MA | M (S) | M (2) | M (3–5) | D (S) | D (2) | D (3–4) |
| Oval | 76.9 | 70.5 | 64.9 | 86.8 | 71.1 | 84.3 |
| Round | 19.2 | 21.9 | 29.8 | 11.8 | 24.2 | 9.8 |
| Irregular | 3.9 | 7.6 | 5.3 | 1.4 | 4.7 | 5.9 |
| n | 26 | 146 | 114 | 76 | 128 | 51 |
| 2nd MA | M (S) | M (2) | M (3–5) | D (S) | D (2) | D (3–4) |
| Oval | 82.0 | 82.6 | 85.7 | 81.7 | 63.7 | 100.0 |
| Round | 14.0 | 10.6 | 14.2 | 14.6 | 27.5 | 0.0 |
| Irregular | 4.0 | 6.8 | 0.0 | 3.7 | 8.8 | 0.0 |
| n | 50 | 132 | 7 | 82 | 102 | 3 |
1st, first; 2, two foramina; 2nd, second; 3, three foramina; 3–5, three, four or five foramina; 3–4, three or four foramina; D, distal; DB, distobuccal; M, mesial; MA, mandibular; MB, mesiobuccal; MX, maxillary; n, total foramina per root; P, palatal; S; single foramen.