FDI World Dental Federation notation (also called FDI notation or ISO3950 notation) is the world's most commonly used dental notation (tooth numbering system).FDI Two-Digit Notation , hosted on the FDI World dental Federation website. Page accessed April 1, 2007. It is designated by the International Organization for Standardization as standard ISO3950 "Dentistry — Designation system for teeth and areas of the oral cavity".ISO 3950:2016 Dentistry — 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.
Table of codes
+ FDI two-digit notation Permanent teeth patient's upper right patient's upper left18171615141312112122232425262728 patient's lower right patient's lower left48474645444342413132333435363738 Deciduous teeth (baby teeth) upper right upper left 55545352516162636465 lower right lower left 85848382817172737475
Codes, names, and usual number of roots: (see chart of teeth at Universal Numbering System)
11 21 51 61 maxillary central incisor 1 41 31 81 71 mandibular central incisor 1 12 22 52 62 maxillary lateral incisor 1 42 32 82 72 mandibular lateral incisor 1 13 23 53 63 maxillary canine 1 43 33 83 73 mandibular canine 1 14 24 maxillary first premolar 2 44 34 mandibular first premolar 1 15 25 maxillary second premolar 1 45 35 mandibular second premolar 1 16 26 54 64 maxillary first molar 3 46 36 84 74 mandibular first molar 2 17 27 55 65 maxillary second molar 3 47 37 85 75 mandibular second molar 2 18 28 maxillary third molar 3 48 38 mandibular third molar 2
How the codes are constructed
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.
+ Quadrant codes1upper right permanent teeth2upper left permanent teeth3lower left permanent teeth4lower right permanent teeth5upper right deciduous teeth6upper left deciduous teeth7lower left deciduous teeth8lower right deciduous teethThis is set by going clockwise from the dentist's view.
+ Tooth codes1central incisors2lateral incisors3canines / cuspids41st premolars / bicuspids (permanent teeth) / 1st molar (deciduous teeth)52nd premolars / bicuspids (permanent teeth) / 2nd molar (deciduous teeth)61st molars (permanent teeth)72nd molars (permanent teeth)83rd molars / wisdom teeth (permanent teeth)This is defined by counting from the center outward.
Examples: "13" = permanent upper right, 3rd tooth (canine / cuspid) "32" = permanent lower left, 2nd tooth (lateral incisor)
See also Dental notation Universal numbering system Palmer notation
References
External links Dr.Bunn page on dental notations. https://www.youtube.com/watch?v=ea7lC42BVA8