fdi world dental federation notation 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). it is designated by the international organization for standardization as standard iso 3950 "dentistry — designation system for teeth and areas of the oral cavity". 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) 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 iso notation upper jaw iso notation lower jaw iso notation primary teeth 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)