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Mixed dentition space analysis in a Thai population.

J Jaroontham¹, K Godfrey

¹Department of Orthodontics, Faculty of Dentistry, Khon Kaen University, Thailand.

European Journal of Orthodontics

|May 24, 2000

Summary

This study developed regression equations for mixed dentition space analysis in Thai populations. These equations predict tooth size, aiding orthodontists in treatment planning for males and females.

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Area of Science:

Dentistry
Orthodontics
Anthropology

Background:

Accurate mixed dentition space analysis is crucial for orthodontic treatment planning.
Existing prediction methods may not be universally applicable across diverse populations.

Purpose of the Study:

To develop simple linear regression equations for mixed dentition space analysis.
To establish sex-specific and pooled regression models for a northeastern Thai population.
To compare predictions with existing methods like Moyers' tables.

Main Methods:

Dental casts of 215 males and 215 females (mean age 15.7 years) from northeastern Thailand were analyzed.
Mesio-distal tooth widths were measured to 0.01 mm.
Simple linear regression and ANOVA were used to derive and validate prediction equations.

Main Results:

Males exhibited significantly larger teeth (mandibular incisor, canine, premolar summation) than females.
Regression analysis showed a strong correlation between mandibular incisor summation and canine/premolar summation.
Coefficients of determination (r2) ranged from 0.29 to 0.42, with higher values for females.

Conclusions:

The derived regression equations provide reliable predictions for tooth size summation in mixed dentition.
The equations offer population-specific data for northeastern Thailand, potentially improving orthodontic diagnostics.
Moyers' prediction tables underestimated tooth size summation compared to this study's findings.

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