DOI: 10.36347/sjds.2021.v08i01.008

Pages: 52-57

Objective: The objective of this study was to investigate the frequency and to compare the overall and anterior ratios of tooth size discrepancies in all Angle malocclusions groups. Materials and methods: The mesio-distal tooth width and arch width were measured on a total of 120 orthodontic 3D models of Tunisian patients aged between 18–37 years of different occlusal relationships (Class I, Class II division 1 Class II division 2 and Class III malocclusions). The overall and anterior ratios between the maxillary and mandibular teeth were evaluated using Bolton’s method. The following statistical tests were applied: independent t-test, and one-way ANOVA. Results: Women presented smaller teeth than men, which mainly concern the first molar in the maxilla, the canine, the second premolar and the first molar in the mandible. The anterior ratio was 78.59% ± 2.47, with 78.93% ± 2.41 for men and 78.26% ± 2.54 for women and the overall ratio was 91.69% ± 1.41 with 92.21% ± 1.30 for men and 91.16% ± 2.37 for women. There was no relationship between anterior and overall ratio and gender or malocclusion groups. Conclusion: This work showed the presence of sexual dimorphism concerning tooth size. Our comparison of the TSD results with those noted by Bolton, showed anterior and overall ratios that are slightly higher than his standard values. Therefore, the original Bolton's values should be used conservatively in Tunisian population. No differences in the overall and anterior ratios of tooth size discrepancies were found among Angle malocclusion groups and gender.