ISO system by WHO for teeth notation
Normal OPG. Used for numerical teeth notation.
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ISO dental notations annotated onto the specific teeth.
The 4 quadrants are shown in different colors for visual ease.
The International Standards Organization Designation System (ISO System) was developed by the World Health Organization (WHO). It is a dental notation system commonly used by dental professionals across the world to associate information with a specific tooth.
The ISO System uses a two-digit numbering system in which the first digit represents a tooth's quadrant and the second digit represents the number of the tooth from the midline of the face.
For permanent teeth, the upper right teeth begin with the number, "2". The upper left teeth begin with the number, "1". The lower left teeth begin with the number, "3". The lower right teeth begin with the number, "4".
For example, the left upper lateral incisor is labeled '22'. The right lower third molar is labeled '48'.
The normal adult OPT from https://radiopaedia.org/cases/normal-orthopantomography-opg-3 was used for the purposes of annotation.