Universal tooth 18
Tooth 18: Lower Left Second Molar
In the Universal Numbering System, tooth 18 is the lower left second molar (mandibular left second molar). Its FDI (ISO 3950) designation is 37 and its Palmer designation is 7 in the lower left quadrant. It is a molar in the lower arch with typically 2 roots.
- Universal
- 18
- FDI / ISO 3950
- 37
- Palmer
- 7
- Type
- Molar
- Arch & side
- lower, left
- Typical roots
- 2
Lower left · Permanent
Lower Left Second Molar
Mandibular Left Second Molar
- Universal
- 18
- FDI / ISO
- 37
- Palmer
- 7
- Type: Molar
- Arch & side: Lower (mandibular), left
- Typical roots: 2 (varies between individuals)
Full conversion table
Print / save as PDFUpper right
| Tooth | Universal | FDI | Palmer |
|---|---|---|---|
| 8 | 11 | 1 | |
| 7 | 12 | 2 | |
| 6 | 13 | 3 | |
| 5 | 14 | 4 | |
| 4 | 15 | 5 | |
| 3 | 16 | 6 | |
| 2 | 17 | 7 | |
| 1 | 18 | 8 |
Upper left
| Tooth | Universal | FDI | Palmer |
|---|---|---|---|
| 9 | 21 | 1 | |
| 10 | 22 | 2 | |
| 11 | 23 | 3 | |
| 12 | 24 | 4 | |
| 13 | 25 | 5 | |
| 14 | 26 | 6 | |
| 15 | 27 | 7 | |
| 16 | 28 | 8 |
Lower left
| Tooth | Universal | FDI | Palmer |
|---|---|---|---|
| 24 | 31 | 1 | |
| 23 | 32 | 2 | |
| 22 | 33 | 3 | |
| 21 | 34 | 4 | |
| 20 | 35 | 5 | |
| 19 | 36 | 6 | |
| 18 | 37 | 7 | |
| 17 | 38 | 8 |
Lower right
| Tooth | Universal | FDI | Palmer |
|---|---|---|---|
| 25 | 41 | 1 | |
| 26 | 42 | 2 | |
| 27 | 43 | 3 | |
| 28 | 44 | 4 | |
| 29 | 45 | 5 | |
| 30 | 46 | 6 | |
| 31 | 47 | 7 | |
| 32 | 48 | 8 |