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Mesial migration and lower third molar tilt

British Journal of Orthodontics

|January 1, 1982

Summary

This summary is machine-generated.

Early extraction of deciduous molars in children may improve the orientation of developing third molars. This study found less angulation in third molar crypts when deciduous molars were removed earlier.

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Area of Science:

Dentistry
Orthodontics
Pediatric Dentistry

Background:

The position of developing third molars (wisdom teeth) is influenced by various developmental factors.
Early loss of deciduous (baby) teeth can lead to significant changes in the alignment of permanent teeth, including mesial (forward) migration.

Purpose of the Study:

To investigate the effect of early deciduous molar extraction on the angulation of developing lower third molars.
To test the hypothesis that mesial migration of permanent molars improves third molar crypt orientation.

Main Methods:

Comparison of lower third molar angulation in radiographs of children aged 10.1–13.0 years.
Two groups were analyzed: one with deciduous molars present, and one with early extraction leading to mesial migration of first permanent molars and premolar impaction.

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Main Results:

Lower third molar crypts showed significantly less angulation (mean difference of 12.5 degrees, p < 0.001) in the group with early deciduous molar removal.
Evidence suggests a potential reduction of approximately 20 degrees in third molar tilt when mesial migration precedes crypt formation.

Conclusions:

Early extraction of lower second deciduous molars and subsequent mesial migration of permanent teeth appear to positively influence the orientation of developing lower third molars.
This finding supports the hypothesis that improved space management in early dentition can lead to better third molar development positioning.