FDI World Dental Federation notation

FDI World Dental Federation notation (also "FDI notation" or "ISO 3950 notation") is the world's most commonly used dental notation (tooth numbering system).[1] It is designated by the International Organization for Standardization as standard ISO 3950 "Dentistry — Designation system for teeth and areas of the oral cavity".[2]

FDI Notation, teeth's quadrants

The system is developed by the FDI World Dental Federation. It is also used by the World Health Organization, and is used in most countries of the world except the United States (which uses the UNS).

Orientation of the chart is traditionally "dentist's view", i.e. patient's right corresponds to notation chart left. The designations "left" and "right" on the chart below correspond to the patient's left and right.

Table of codes

X-ray of the teeth and jaw showing the normal permanent teeth. The last two teeth on the patient's left (the dentist's right), 28 and 38 - the maxillary and mandibular third molars (popularly the upper and lower wisdom teeth) are severely impacted.
FDI two-digit notation
Permanent teeth
patient's upper rightpatient's upper left
18171615141312112122232425262728
48474645444342413132333435363738
patient's lower rightpatient's lower left
Deciduous teeth (baby teeth)
upper rightupper left
55545352516162636465
85848382817172737475
lower rightlower left
Comparison of alphanumeric notation, Palmer notation, ISO 3950 (FDI) notation, Universal Numbering System, and paleoanthropology notation

Codes, names, and usual number of roots: (see chart of teeth at Universal Numbering System)

How the codes are constructed

Syntax: <quadrant code><tooth code>

Sometimes a dot is inserted between quadrant code and tooth code in order to avoid ambiguity with other numbering systems, especially the UNS.

Quadrant codes
1upper right permanent teeth
2upper left permanent teeth
3lower left permanent teeth
4lower right permanent teeth
5upper right deciduous teeth
6upper left deciduous teeth
7lower left deciduous teeth
8lower right deciduous teeth
This is set by going clockwise from the dentist's view.
Tooth codes
1central incisors
2lateral incisors
3canines
41st premolars (permanent teeth) / 1st molar (deciduous teeth)
52nd premolars (permanent teeth) / 2nd molar (deciduous teeth)
61st molars (permanent teeth)
72nd molars (permanent teeth)
83rd molars (permanent teeth)
This is defined by counting.

Examples:

  • "13" = permanent upper right, 3rd tooth (canine)
  • "32" = permanent lower left, 2nd tooth (lateral incisor)

See also

References

  1. FDI Two-Digit Notation Archived 2007-04-01 at the Wayback Machine, hosted on the FDI World dental Federation Archived 2007-07-18 at the Wayback Machine website. Page accessed April 1, 2007.
  2. ISO 3950:2016 Dentistry Designation system for teeth and areas of the oral cavity
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