APPLICABILITY OF TANAKA JOHNSTON METHOD ON PAKISTANI POPULATION

Abstract

Tanaka and Johnston method is commonly used to predict the sizes of unerupted canines and premolars at mixed dentition stage. The accuracy of this method varies among different populations. The aim of this study was to derive the new regression equations for Pakistani population. The study models of 200 patients were selected. The mesiodistal widths of the permanent mandibular incisors, all canines and premolars were measured. Regression analyses were used to derive new regression equations for Pakistani population. The estimated mesiodistal widths of the maxillary and mandibular canines and premolars derived through Tanaka and Johnston method were significantly greater than the actual measured mesiodistal width of these teeth. The Tanaka and Johnston prediction equation overestimated the mesiodistal widths of canine and premolars in Pakistani population. The new prediction equations derived from this study would be more accurate for Pakistani population.