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Universal tooth 9

Tooth 9: Upper Left Central Incisor

In the Universal Numbering System, tooth 9 is the upper left central incisor (maxillary left central incisor). Its FDI (ISO 3950) designation is 21 and its Palmer designation is 1 in the upper left quadrant. It is a incisor in the upper arch with typically 1 root.

Universal
9
FDI / ISO 3950
21
Palmer
1
Type
Incisor
Arch & side
upper, left
Typical roots
1
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Upper left · Permanent

Upper Left Central Incisor

Maxillary Left Central Incisor

Universal
9
FDI / ISO
21
Palmer
1
  • Type: Incisor
  • Arch & side: Upper (maxillary), left
  • Typical roots: 1 (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