Dental notation

This article is about human tooth numbering. For the general mammalian dental formula, see dentition.

Dental professionals, in writing or speech, use several different dental notation systems for associating information with a specific tooth. The three most common systems are the ISO System, Universal Numbering System, and Palmer notation method. The ISO system is used worldwide, and the Universal is used widely in the United States. The ISO System can be easily adapted to computerized charting.

History

A committee of the American Dental Association (ADA) recommended the use of the Palmer notation method in 1947. Since this method required the use of symbols, its use was difficult on keyboards. As a result, the association officially supported the Universal system in 1968. The World Health Organization and the Fédération Dentaire Internationale officially uses the two-digit numbering system of the FDI system. However, in 1996, the ADA adopted the ISO System as an alternative to the Universal System.

ISO System by the World Health Organization

FDI Notation, teeth's quadrants

The International Standards Organization Designation System (ISO System) by the World Health Organization notation system is widely used by dental professionals internationally to associate information with a specific tooth. Based on the Fédération Dentaire Internationale (FDI), it is also known as ISO 3950^[1] notation. Thus the ISO System uses a two-digit numbering system in which the first number represents a tooth's quadrant and the second number represents the number of the tooth from the midline of the face. For permanent teeth, the upper right teeth begin with the number, "1". The upper left teeth begin with the number, "2". The lower left teeth begin with the number, "3". The lower right teeth begin with the number, "4". For primary teeth, the sequence of numbers goes 5, 6, 7, and 8 for the teeth in the upper right, upper left, lower left, and lower right respectively. When speaking about a certain tooth such as the permanent maxillary central incisor, the notation is pronounced “one, one”. Beware of mixing up the teeth in written form such as 11, 12, 13, 14, 15, 16, 17, 18 between the Universal and ISO systems.

For example: retention of a primary molar tooth in the otherwise regular intact lower right jaw, position 5, would be noted as: 41, 42, 43, 44, 85, 46, 47, 48.

ISO notation upper jaw
ISO notation lower jaw
ISO notation primary teeth

                    Permanent Dentition
        upper right - 1             upper left - 2
    18 17 16 15 14 13 12 11 | 21 22 23 24 25 26 27 28 
 R --------------------------------------------------- L
    48 47 46 45 44 43 42 41 | 31 32 33 34 35 36 37 38 
        lower right - 4             lower left - 3 

                    Primary Dentition
        upper right - 5             upper left - 6
             55 54 53 52 51 | 61 62 63 64 65 
          R --------------------------------- L
             85 84 83 82 81 | 71 72 73 74 75 
        lower right - 8             lower left - 7

 I - incisor
 C - canine
 P - premolar
 M - molar

Palmer notation method

Main article: Palmer Notation Method

The Palmer notation is a system used by dentists to associate information with a specific tooth. Although supposedly superseded by the FDI World Dental Federation notation, it overwhelmingly continues to be the preferred method used by dental students and practitioners in the United Kingdom.^[2] It was originally termed the "Zsigmondy system" after the Hungarian dentist Adolf Zsigmondy who developed the idea in 1861, using a Zsigmondy cross to record quadrants of tooth positions.^[3] Permanent teeth (adult) were numbered 1 to 8, and the child primary dentition (also called deciduous, milk or baby teeth) were depicted with a quadrant grid using Roman numerals I, II, III, IV, V to number the teeth from the midline distally. Palmer changed this to A, B, C, D, E.

The Palmer notation consists of a symbol (┘└ ┐┌) designating in which quadrant the tooth is found and a number indicating the position from the midline. Adult teeth are numbered 1 to 8, with primary teeth indicated by a letter A to E. Hence the left and right maxillary central incisor would have the same number, "1", but the right one would have the symbol, "┘", underneath it, while the left one would have, "└".

                    Permanent Dentition
        upper right - 1x            upper left - 2x
            8 7 6 5 4 3 2 1 | 1 2 3 4 5 6 7 8 
  R --------------------------------------------------- L
            8 7 6 5 4 3 2 1 | 1 2 3 4 5 6 7 8
        lower right - 4x            lower left - 3x

                     Primary Dentition
        upper right - 5x            upper left - 6x
                 E D C B A | A B C D E 
          R --------------------------------- L
                 E D C B A | A B C D E 
        lower right - 8x            lower left - 7x

I - Incisor
C - Canine
P - premolar
M - molar

Universal numbering system

Main article: Universal numbering system (dental)

Although it is termed "universal numbering system", it is most commonly used in the United States. It is also called the "American system".^[4] The uppercase letters A through T are used for primary teeth and the numbers 1 - 32 are used for permanent teeth. The tooth designated "1" is the maxillary right third molar ("wisdom tooth") and the count continues along the upper teeth to the left side. Then the count begins at the mandibular left third molar, designated number 17, and continues along the bottom teeth to the right side. Each tooth has a unique number or letter, allowing for easier use on keyboards.

Universal numbering system table
Permanent Dentition
upper right								upper left
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17
lower right								lower left

Primary Dentition
upper right								upper left
			A	B	C	D	E	F	G	H	I	J
			T	S	R	Q	P	O	N	M	L	K
lower right								lower left

Alternate system for Primary Dentition
upper right								upper left
			1d	2d	3d	4d	5d	6d	7d	8d	9d	10d
			20d	19d	18d	17d	16d	15d	14d	13d	12d	11d
lower right								lower left

Letters and numbers system

The 4 quadrants are designated:

UR - upper right
UL - upper left
LR - lower right
LL - lower left

Within each quadrant, the teeth are numbered as in the Palmer notation: 1-8 for permanent and A-E for deciduous, both starting at the midline.

For example, permanent upper left first molar: UL6

References

↑ ISO 3950:2009 Dentistry — Designation system for teeth and areas of the oral cavity
↑ Blinkhorn A, Choi C, Paget H (1998). "An investigation into the use of the FDI tooth notation system by dental schools in the UK.". Eur J Dent Educ. 2 (1): 39–41. doi:10.1111/j.1600-0579.1998.tb00034.x. PMID 9588962.
↑ Huszár G (1989). "[The role of the life and works of Adolf Zsigmondy and Ottó Zsigmondy in the history of dentistry][Article in Hungarian]". Fogorv Sz. 82 (12): 357–63. PMID 2689240.
↑ "Histology: A Text and Atlas by Michael H. Ross • Wojciech Pawlina".

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