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The Universal Numbering System also called the "American System", is a dental notation system for associating information to a specific tooth,^[1] commonly used in the United States.

In the rest of the world, a different International Standard (DIN EN) ISO 3950:2016^[2] is used.

Left and right

Dental charts are normally arranged from the viewpoint of a dental practitioner facing a patient. The patient's right side appears on the left side of the chart, and the patient's left side appears on the right side of the chart.

The labels "right" and "left" on the charts in this article correspond to the patient's right and left, respectively.

Universal numbering system

Although it is named the "universal numbering system", it is also called the "American system" as it is only used in the United States.^[3] 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

Tooth numbering

Permanent teeth and their assigned numbers (Universal Tooth Numbering System)

Upper right

3rd molar (wisdom tooth)
2nd molar (12-yr molar)
1st molar (6-yr molar)
2nd bicuspid (2nd premolar)
1st bicuspid (1st premolar)
Cuspid (canine/eye tooth)
Lateral incisor
Central incisor

Upper left

Central incisor
Lateral incisor
Cuspid (canine/eye tooth)
1st bicuspid (1st premolar)
2nd bicuspid (2nd premolar)
1st molar (6-yr molar)
2nd molar (12-yr molar)
3rd molar (wisdom tooth)

Lower left

3rd molar (wisdom tooth)
2nd molar (12-yr molar)
1st molar (6-yr molar)
2nd bicuspid (2nd premolar)
1st bicuspid (1st premolar)
Cuspid (canine/eye tooth)
Lateral incisor
Central incisor

Lower right

Central incisor
Lateral incisor
Cuspid (canine/eye tooth)
1st bicuspid (1st premolar)
2nd bicuspid (2nd premolar)
1st molar (6-yr molar)
2nd molar (12-yr molar)
3rd molar (wisdom tooth)

References

^ "Tooth Numbering Systems". Oral Health Topics A–Z. American Dental Association. Archived from the original on November 2, 2006. Retrieved 2014-05-26. (www.archive.org link)
^ ISO 3950 Updated – Dentistry Designation System
^ "Histology: A Text and Atlas by Michael H. Ross • Wojciech Pawlina".

External links

[1] "Tooth Numbering Systems". Oral Health Topics A–Z. American Dental Association. Archived from the original on November 2, 2006. Retrieved 2014-05-26. (www.archive.org link)

[2] ISO 3950 Updated – Dentistry Designation System

[3] "Histology: A Text and Atlas by Michael H. Ross • Wojciech Pawlina".

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 ==External links==
-*[https://www.youtube.com/watch?v=TQo2uprzn9E Dental Notations Demonstration: ISO System, Universal Numbering System, and Palmer Notation Method]
 *[http://www.drbunn.com/faq/tooth-numbering Dr. Bunn page on dental notations].
 *[https://www.youtube.com/watch?v=i5Ihx2aV7VA&t=51s Video regarding the Universal Numbering System]