Abstract
Introduction: Tooth size discrepancy varies between different ethnic groups and races. Bolton’s tooth size norms were originally determined in Caucasian population.Objective: To determine tooth size ratios for maxillary and mandibular dentition in Telangana population of Indian sample and to compare the ratios with standard Bolton norms.Materials & Method: The study sample comprised of 300 subjects (150 males and 150 females) aged between 14-25 years having Angle’s Class 1 molar relationship. Study models of all subjects were prepared and mesiodistal dimensions were measured to determine mean Bolton’s anterior ratio, overall ratio, over jet and overbite.Result: Evidence of sexual dimorphism was observed with Indian male subjects having greater mean values than the females. The determined mean for anterior tooth ratio was 80.88 ± 3.03%, overall tooth ratio 93.99 ± 3.11%, overjet 2.92 ± 0.62mm and overbite 2.96 ± 0.63mm. Statistically significant differences were found between Indian samples and Bolton Caucasian standards.Conclusion: The study provides evidence that tooth sizes are population specific. Mean values specific to particular population groups should be derived in order to make treatment planning more accurate and predictable.
Highlights
Tooth size discrepancy varies between different ethnic groups and races
The parameters evaluated in the study were the overjet, overbite, anterior and overall Bolton tooth ratios
Alginate impressions were made for all subjects and study models were prepared
Summary
Tooth size discrepancy varies between different ethnic groups and races. Bolton’s tooth size norms were originally determined in Caucasian population. The size of the teeth plays a very important role in overall treatment planning. Mismatched tooth sizes prevent the clinician from achieving balanced and functional occlusion. Understanding the interplay between arch length and tooth material is the key to overall treatment success. Arch form and its dimensions, spacing and tooth size - arch length discrepancies should be accurately determined as a part of routine orthodontic treatment planning. According to Proffit, natural teeth have a good ratio in most individuals, part of the population (5%) has some degree of disproportion in tooth size.[2]
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