Abstract
Introduction: The orthodontic examination may be incomplete without a careful analysis of the patterns of mesiodistal crownsize relationships. No published data are available regarding tooth size— arch length discrepancy (Bolton values) for Kerala population. Aim: To establish Bolton's values specific to Kerala population. Thus, this was done in order to determine Bolton's anterior and overall and posterior ratio between males and females specific to Kerala population and compare it with Bolton's values. Secondly to determine the values outside of 1 standard deviation (SD) and 2SD. Materials and methods: The sample for the present study consisted of 160 pretreatment study casts (Group A— 75 male patients and Group B— 85 female patients). Digital vernier caliper (Standard Digital Caliper Series: EC16) with a 0.01 mm resolution, ±0.02 mm accuracy and 0.01 mm repeatability, manufacturer specification) was used to measure the mesiodistal width of the teeth. Result: Mean anterior, overall and posterior ratios were found to be 77.32 ± 6.67; 91.78 ± 7.43; 1.07 ± 0.06 respectively. 93.8% of the sample had anterior ratio in 1SD and 3.8% in 2SD. 94.4% were in 1SD and 2.5% in 2SD for overall ratio. Conclusion: Although the means were nearly identical with those of Bolton's study, ranges and SDs were significantly larger. This study indicates that the Bolton's analysis can also be used on Indian or at least Kerala population but with increased standard deviation.
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