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<b>Objective:</b> The purpose of this study was to investigate the morphological characteristics of deciduous teeth of children in Chennai and Hyderabad, by establishing normal data on the mesiodistal and buccolingual crown dimensions in 3-5 year old children. <b>Materials and Methods:</b> Study casts of 200 children (100 boys and 100 girls) from two groups (Chennai and Hyderabad) were used in this study. Digital caliper was used to measure the mesiodistal and buccolingual dimensions. <b>Results and Conclusion:</b> Significant differences were found in the mean values of mesiodistal and buccolingual diameters of primary teeth, in which boys generally had larger crown diameters than girls.