A tooth-Size discrepancy of Normal Occlusion and Class II Division 1 Malocclusion in North Indian Population

Abstract

Objective: The aims of this study were to compare the tooth size ratios of a North Indian population to the Bolton ratios, determine sex differences in tooth-size ratios, and determine whether there is a difference in intermaxillary tooth-size discrepancies for malocclusion subjects. Subjects and Methods: 40 samples with normal occlusion and 40 patients with Class II division 1 malocclusion were randomly selected with the age range of 13 to 25 years equally divided among males and females. The mesiodistal crown dimension was measured using a digital caliper accurate to 0.01 mm. For statistical evaluation, descriptive statistics and Student’s t-test were performed. Results: No statistical significant differences were obtained between the mean values of the anterior ratio and overall ratio of the present study and the mean values reported by Bolton. The overall ratio among the normal occlusion and Class II division 1 malocclusion groups showed statistically significant differences (p <0.05). The tooth most closely related to the overall ratio in the Class II division 1 malocclusion group was the mandibular second premolar. Conclusion: The results of this study show that the overall and anterior Bolton ratios can be applied with confidence to an Indian population. There is a tendency for maxillary tooth size excess in the Class II division 1 malocclusion patients of the same population. It can be concluded that Bolton tooth size analysis is an important diagnostic tool and should be taken into consideration before the initiation of orthodontic treatment.