Interarch tooth size relationship of Indian population: does Bolton's analysis apply?

Area of Science:

• Dentistry
• Orthodontics
• Anthropology

Background:

• Accurate diagnosis and treatment planning in orthodontics rely on understanding inter-arch tooth size discrepancies.
• Existing methods like Bolton's analysis lack specific data for the Indian population.
• This deficiency hinders effective orthodontic care for Indian patients.

Purpose of the Study:

• To determine individual permanent tooth sizes and sex differences in the Indian population.
• To calculate tooth size ratios using Bolton's formula.
• To evaluate the applicability of Bolton's norms for Indian patients.

Main Methods:

• Selection of 120 individuals with excellent natural occlusion (mean age 22 years).
• Dental cast preparation from alginate impressions.
• Measurement of mesiodistal crown dimensions using a digital Vernier caliper.

Main Results:

• The mean overall tooth ratio for the Indian population was 92.11 (SD 2.12).
• The mean anterior ratio was 78.14 (SD 2.59).
• Significant differences were observed in both overall and anterior ratios compared to Bolton's established norms.

Conclusions:

• Bolton's original norms are not representative of the Indian population.
• Greater size variability was noted in maxillary teeth compared to mandibular teeth.
• Population-specific standards are essential for accurate orthodontic assessments in India.