Applicability of Different Mixed Dentition Analyses among Children Aged 11–13 Years in Chennai Population

INTRODUCTION: Mixed dentition is the stage where both primary and permanent teeth are present and hence is the time for developing occlusion. Mixed dentition analysis forms an essential part of an orthodontic assessment. Moyer's method which is commonly used for this analysis is based on data derived from a Caucasian population. Tanaka–Johnston developed prediction tables comparable with that of Moyer's from teeth measurement study models. AIM: To test the reliability of Moyer's and Tanaka–Johnston's mixed dentition space analyses among children in Chennai. MATERIALS AND METHODS: The mesiodistal measurements of the mandibular incisors, maxillary canines, and premolars were taken by measuring the greatest distance between the contact points on the proximal surfaces using a dental digital caliper set on dental casts of 1,000 children. Predicted values were obtained using Moyer's probability analysis at the 75th percentile and Tanaka–Johnston method. The statistical analysis for both sexes was done using Student's t test and unpaired t test. RESULTS: On application of the statistical analysis after the collection of data, it was found that the mean value in males was higher than the actual values in maxillary right and left sides when compared with the mandibular right and left sides while employing Moyer's method. The standard deviation (SD) was higher in the actual values when compared with the predicted values. Statistically significant values were obtained for the maxillary left side and the mandibular left side, but there was no statistical difference in the maxillary and mandibular right sides. Among females, it was found that the actual values had a higher mean value in the maxillary arch when compared with the mandibular arch than the values obtained when Moyer's formula was applied. CONCLUSION: Both Moyer's and Tanaka–Johnson's mixed analyses when applied to children in Chennai tended to show that predicted values were higher than actual values with no significant differences observed among the regression equations. HOW TO CITE THIS ARTICLE: Ravinthar K, Gurunathan D. Applicability of Different Mixed Dentition Analyses among Children Aged 11–13 Years in Chennai Population. Int J Clin Pediatr Dent 2020;13(2):163–166.