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Universal tooth 31

Tooth 31: Lower Right Second Molar

In the Universal Numbering System, tooth 31 is the lower right second molar (mandibular right second molar). Its FDI (ISO 3950) designation is 47 and its Palmer designation is 7 in the lower right quadrant. It is a molar in the lower arch with typically 2 roots.

Universal
31
FDI / ISO 3950
47
Palmer
7
Type
Molar
Arch & side
lower, right
Typical roots
2
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Lower right · Permanent

Lower Right Second Molar

Mandibular Right Second Molar

Universal
31
FDI / ISO
47
Palmer
7
  • Type: Molar
  • Arch & side: Lower (mandibular), right
  • Typical roots: 2 (varies between individuals)

Full conversion table

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Upper right

ToothUniversalFDIPalmer
8111
7122
6133
5144
4155
3166
2177
1188

Upper left

ToothUniversalFDIPalmer
9211
10222
11233
12244
13255
14266
15277
16288

Lower left

ToothUniversalFDIPalmer
24311
23322
22333
21344
20355
19366
18377
17388

Lower right

ToothUniversalFDIPalmer
25411
26422
27433
28444
29455
30466
31477
32488