What is the abbreviated system for identifying teeth using a two-digit code?

The FDI System, also known as the Federation Dentaire Internationale notation, is an abbreviated system that utilizes a two-digit code to identify teeth. In this system, the first digit indicates the quadrant of the mouth and the second digit specifies the position of the tooth within that quadrant. For example, the first digit can range from 1 to 4, corresponding to different quadrants: 1 for the upper right, 2 for the upper left, 3 for the lower left, and 4 for the lower right. The second digit ranges from 1 to 8, identifying the specific tooth from the midline toward the back of the mouth. This method allows for a systematic and straightforward way to identify and communicate about dental health, making it widely used in various dental practices globally.

This system stands out because it simplifies the process of recording and referencing teeth quickly and efficiently. While the Universal Numbering System and other methods have their own advantages and use cases, they do not use the same two-digit format that characterizes the FDI System.