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Overjet and overbite distribution and correlation: a comparative epidemiological English-Iraqi study
British Journal of Orthodontics
|April 1, 1986
Summary
A new gauge helps measure incisor relationships, defining normal overjet and overbite as 2-4 mm. English samples showed higher values, while Iraqi samples had lower ones, with a significant correlation between the two measurements.
Area of Science:
- Dentistry
- Orthodontics
- Anthropology
Background:
- Lack of standardized criteria for evaluating incisor relationships (overjet and overbite).
- Absence of widely accepted normal values for overjet and overbite.
- Need for a reliable and efficient measurement tool.
Purpose of the Study:
- To develop and validate a simple, metric gauge for measuring overjet and overbite.
- To establish reference ranges for normal overjet and overbite values.
- To compare incisor relationships in English and Iraqi populations.
Main Methods:
- Development of a novel metric overbite and overjet gauge.
- Application of the gauge to a sample of 236 English individuals.
- Application of the gauge to a sample of 250 Iraqi individuals.
Main Results:
- The normal range for overjet and overbite was established as 2-4 mm.
- English samples exhibited a tendency towards increased overjet and overbite.
- Iraqi samples demonstrated a tendency towards lower values for both overjet and overbite.
- A statistically significant correlation (p < 0.01) was observed between overjet and overbite in both populations.
Conclusions:
- The developed gauge provides a reliable method for assessing incisor relationships.
- Population-specific variations in overjet and overbite exist between English and Iraqi samples.
- The findings contribute to a better understanding of normal incisor parameters in different ethnic groups.