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Primary tooth O

Tooth O: Primary Lower Left Central Incisor

In the Universal Numbering System, primary tooth O is the primary lower left central incisor (primary mandibular left central incisor). Its FDI (ISO 3950) designation is 71 and its Palmer designation is A in the lower left quadrant. It is a incisor in the lower arch with typically 1 root.

Universal
O
FDI / ISO 3950
71
Palmer
A
Type
Incisor
Arch & side
lower, left
Typical roots
1
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Lower left · Primary

Primary Lower Left Central Incisor

Primary Mandibular Left Central Incisor

Universal
O
FDI / ISO
71
Palmer
A
  • Type: Incisor
  • Arch & side: Lower (mandibular), left
  • Typical roots: 1 (varies between individuals)

Full conversion table

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Upper right

ToothUniversalFDIPalmer
E51A
D52B
C53C
B54D
A55E

Upper left

ToothUniversalFDIPalmer
F61A
G62B
H63C
I64D
J65E

Lower left

ToothUniversalFDIPalmer
O71A
N72B
M73C
L74D
K75E

Lower right

ToothUniversalFDIPalmer
P81A
Q82B
R83C
S84D
T85E