FDI World Dental Federation notation (also called FDI notation or ISO3950 notation) is the world's most commonly used dental notation (tooth numbering system). It is designated by the International Organization for Standardization as standard ISO395 "Dentistry â Designation system for teeth and areas of the oral cavity".
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).
The system uses two numbers to define each tooth. One to specify the quadrant, and one to specify the tooth within that quadrant.
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.
Codes, names, and usual number of roots: (see chart of teeth at Universal Numbering System)
The syntax is the quadrant code followed by the tooth code. Sometimes a dot is inserted between the quadrant code and tooth code in order to avoid ambiguity with other numbering systems, especially the UNS.
Examples: