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Updated: Jun 21, 2026

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Published on: August 22, 2022

Mixed-dentition analysis in a Turkish population.

Seher Gündüz Arslan¹, Neval Dildeş, Jalen Devecioğlu Kama

¹Dicle University, Orthodontics, Dental Faculty, Diyarbakır, Turkey. agseher@hotmail.com

World Journal of Orthodontics

|July 8, 2009

Summary

The Tanaka-Johnston analysis is unreliable for predicting canine and premolar sizes in Turkish children. New regression equations developed in this study provide accurate predictions for unerupted teeth in this population.

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Area of Science:

Dentistry
Orthodontics
Anthropology

Background:

Accurate prediction of unerupted canine and premolar tooth sizes is crucial for orthodontic treatment planning.
The Tanaka-Johnston mixed-dentition analysis is a widely used method, but its applicability across diverse ethnic populations requires investigation.

Purpose of the Study:

To evaluate the reliability of the Tanaka-Johnston mixed-dentition analysis in a Turkish pediatric population.
To develop and validate new population-specific regression equations for predicting unerupted canine and premolar mesiodistal dimensions in Turkish children.

Main Methods:

Mesiodistal tooth dimensions were measured on dental casts of 12- to 14-year-old Turkish children.
Actual measurements were compared to predictions from the Tanaka-Johnston equation.

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Newly derived regression equations were validated on a separate group of 50 Turkish children.

Main Results:

The Tanaka-Johnston regression equations significantly overestimated the actual mesiodistal widths of permanent canines and premolars in the study cohort.
The newly developed regression equations demonstrated no statistically significant difference between predicted and actual tooth widths.

Conclusions:

The standard Tanaka-Johnston mixed-dentition analysis is not accurate for predicting unerupted tooth sizes in Turkish individuals.
The novel, population-adjusted regression equations developed in this research offer a reliable method for predicting canine and premolar dimensions in Turkish children.