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Mixed dentition analysis for Asian-Americans

S Lee-Chan1, B N Jacobson, K H Chwa

  • 1Northwestern University School of Dentistry, Chicago, Ill, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|March 28, 1998
PubMed
Summary

The Tanaka and Johnston method for predicting tooth size-arch length is inaccurate for Asian-American children. New regression equations were developed for this population to improve diagnostic accuracy in orthodontics.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Anthropology

Background:

  • Accurate tooth size prediction is crucial for diagnosing mixed dentition.
  • The Tanaka and Johnston method is widely used but based on European descent data.
  • Its applicability to diverse ethnic groups, like Asian-Americans, is questionable.

Purpose of the Study:

  • To evaluate the accuracy of the Tanaka and Johnston prediction method in Asian-American children.
  • To develop new, population-specific prediction equations for tooth size in this demographic.

Main Methods:

  • Analysis of 201 dental plaster casts from Asia-Pacific-American subjects under 21.
  • Comparison of actual tooth measurements with predictions from Tanaka and Johnston equations.
  • Development of new linear regression equations based on collected data.

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Main Results:

  • Significant differences were found between predicted and actual tooth size measurements.
  • The Tanaka and Johnston method demonstrated limitations when applied to the Asian-American sample.
  • New regression equations were derived from the study data.

Conclusions:

  • The Tanaka and Johnston method is not sufficiently accurate for Asian-American children.
  • Developed regression equations offer improved tooth size prediction for this population.
  • This research highlights the need for ethnicity-specific orthodontic diagnostic tools.