Universal Numbering System

This article is about the dental notation system. For the metal alloy numbering system, see Unified numbering system.
Universal numbering system. This is a dental practitioner view, so tooth number 1, the rear upper tooth on the patient's right, appears on the left of the chart.

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

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 commonly used in the United States.[2] 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
lower right lower left
Primary Dentition
upper right upper left
lower right lower left
Alternate system for Primary Dentition
upper right upper left
lower right lower left

Tooth Numbering

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

     upper right
1. 3rd Molar (wisdom tooth)
2. 2nd Molar (12-yr molar)
3. 1st Molar (6-yr molar)
4. 2nd Bicuspid (2nd premolar)
5. 1st Bicuspid (1st premolar)
6. Cuspid (canine/eye tooth)
7. Lateral incisor
8. Central incisor
     upper left
9. Central incisor
10. Lateral incisor
11. Cuspid (canine/eye tooth)
12. 1st Bicuspid (1st premolar)
13. 2nd Bicuspid (2nd premolar)
14. 1st Molar (6-yr molar)
15. 2nd Molar (12-yr molar)
16. 3rd Molar (wisdom tooth)
     lower left
17. 3rd Molar (wisdom tooth)
18. 2nd Molar (12-yr molar)
19. 1st Molar (6-yr molar)
20. 2nd Bicuspid (2nd premolar)
21. 1st Bicuspid (1st premolar)
22. Cuspid (canine/eye tooth)
23. Lateral incisor
24. Central incisor
     lower right
25. Central incisor
26. Lateral incisor
27. Cuspid (canine/eye tooth)
28. 1st Bicuspid (1st premolar)
29. 2nd Bicuspid (2nd premolar)
30. 1st Molar (6-yr molar)
31. 2nd Molar (12-yr molar)
32. 3rd Molar (wisdom tooth)

See also


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

External links

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