Palmer's method of tooth notation

Palmer's method of tooth notation, a system for designating teeth by number and quadrant. The oral cavity is divided into quadrants and each tooth is designated by an Arabic numeral 1 to 8, starting with the central incisor in each quadrant and continuing posteriorly to the third molar. The quadrant is indicated by a right angle symbol oriented right or left and up or down. The system was popular in the 1950s but is no longer in general use except in orthodontic practices.