In the FDI System, what do the two digits represent?

In the FDI System, also known as the World Dental Federation notation, the two digits represent the quadrant of the mouth and the specific tooth within that quadrant. This systematic approach allows for a clear and universal way of identifying teeth, which is especially important in dental practice for communication and record-keeping.

The first digit denotes the quadrant where the tooth is located. For example, in adults, the first digit ranges from 1 to 4, corresponding to the four quadrants of the mouth (upper right, upper left, lower left, lower right). The second digit indicates the specific tooth within that quadrant, using a numbering system where the first tooth in the quadrant is represented by the number 1, progressing to the back of the mouth.

Understanding this system is crucial for dental professionals as it provides a standardized method for referencing teeth, which can improve clarity in communication about dental care and treatment plans.