Estimating the validity of Tanaka-Johnston and Moyer's analysis of a Saudi sample.

Objectives: Accurate estimation of unerupted permanent canines and premolars is a crucial step for effective orthodontic treatment planning during mixed dentition. This study aimed to evaluate the validity of Moyers' charts and the Tanaka-Johnston equation in predicting tooth sizes in a sample of the Madina population in Saudi Arabia and propose a new regression equation.

Methods: Dental casts from 219 subjects (113 males and 106 females) were analyzed.