Universal Numbering System

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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.

In Europe, a different International Standard (DIN EN) ISO 3950:2016[2] is more widely used.

Left and right[edit]

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[edit]

Although it is named the "universal numbering system", it is also called the "American system" as it is commonly 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[edit]

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

  1. Central incisor
  2. Lateral incisor
  3. Cuspid (canine/eye tooth)
  4. 1st bicuspid (1st premolar)
  5. 2nd bicuspid (2nd premolar)
  6. 1st molar (6-yr molar)
  7. 2nd molar (12-yr molar)
  8. 3rd molar (wisdom tooth)

Lower left

  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

Lower right

  1. Central incisor
  2. Lateral incisor
  3. Cuspid (canine/eye tooth)
  4. 1st bicuspid (1st premolar)
  5. 2nd bicuspid (2nd premolar)
  6. 1st molar (6-yr molar)
  7. 2nd molar (12-yr molar)
  8. 3rd molar (wisdom tooth)

See also[edit]

References[edit]

  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".

External links[edit]