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Related Experiment Video

Updated: Apr 30, 2026

Author Spotlight: Insights into an Efficient Murine Maxillary Orthodontic Model Protocol

Author Spotlight: Insights into an Efficient Murine Maxillary Orthodontic Model Protocol

Published on: October 27, 2023

Association between mandibular third molar formation and retromolar space.

Saro S Ghougassian¹, Joseph G Ghafari

¹a Clinical Associate, Division of Orthodontics and Dentofacial Orthopedics, American University of Beirut Medical Center, Beirut, Lebanon.

The Angle Orthodontist

|April 30, 2014

Summary

The development stage of mandibular third molars strongly correlates with the available retromolar space in orthodontic patients. This relationship links dental formation (biologic age) to mandibular growth.

Keywords:

Dental age Development Retromolar space Root formation Third molar

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Area of Science:

Orthodontics
Dental Anatomy
Human Growth and Development

Background:

Assessing mandibular third molar development is crucial for orthodontic treatment planning.
Understanding the relationship between tooth formation and skeletal growth aids in predicting outcomes.

Purpose of the Study:

To evaluate the association between mandibular third molar formation stages and the retromolar space.
To determine if dental development can predict available space for molar eruption.

Main Methods:

Lateral cephalographs of 96 orthodontic patients (ages 8-18) were analyzed.
Nolla's method (10 stages) assessed molar calcification; retromolar space was measured.
Statistical analysis included t-tests, ANOVA, and Pearson correlation.

Main Results:

A high positive correlation (r=0.85) was found between third molar formation stage and retromolar space.
Retromolar space increased with age, peaking between 10-12 years.
A 5 mm increase in retromolar space corresponded to a 1.8 stage advancement in tooth maturation.

Conclusions:

The correlation reflects the link between dental formation (biologic age) and mandibular skeletal growth.
Findings indicate a strong association but do not predict molar impaction or eruption success.
Longitudinal studies are recommended to ascertain eruption outcomes.