Tooth size ratios in Saudi subjects with Class II, Division 1 malocclusion

Objectives: 1) To determine tooth size ratios in Saudi subjects with Class II, Division 1 malocclusion, 2) to compare tooth size ratios between Saudi males and females and 3) to compare tooth size ratios between Saudi subjects with Class II, Division 1, and Saudi subjects with Class I normal occlusion, and Bolton’s results. Methods: The current study consisted of study models of sixty subjects (30 males and 30 females), aged 13 to 20 years. All subjects had Class II, Division 1 malocclusion. An electronic digital caliper was used to measure the individual mesiodistal tooth width of all maxillary and mandibular permanent teeth except second and third molars. Results: The anterior ratio and the overall ratio in Saudi subjects with Class II, Division 1 malocclusion were 77.65 ± 2.79 and 91.93 ± 2.08 respectively. The tooth size ratios were slightly greater in males than females but the differences were not significant. There were no significant differences in the anterior ratio and the overall ratio between Saudi subjects with Class II, Division 1, and Saudi subjects with Class I normal occlusion, and Bolton’s results. Conclusions: The Bolton standards can be applied to Saudis with Class I normal occlusion and Class II, Division 1 malocclusion.