Abstract
A method of cephalometric superimposition, described by Johnston (1986), was evaluated to determine its reliability. Fifteen pairs of before-and after-treatment cephalograms, were measured five times, and an analysis of variance (ANOVA) was carried out on the measurements to check for any significant differences between the repeated measures. The results of the analysis found Johnston’s method of cephalometric superimposition to be reliable and consistent, with lower standard deviations in the measurements found, compared to other commonly used methods.