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How much space is created from expansion or premolar extraction?

E A O'Higgins¹, R T Lee

¹Department of Orthodontics, Chelsea & Westminster Hospital, London, SW10 9NH.

Journal of Orthodontics

|May 3, 2000

Summary

Maxillary arch expansion linearly correlates with reduced arch depth. Premolar extraction led to greater arch depth reduction than tooth width, impacting orthodontic treatment planning.

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Area of Science:

Orthodontics
Dental Morphology

Background:

Understanding the dimensional changes in the maxillary arch during orthodontic treatment is crucial for predicting outcomes.
Maxillary arch depth, often related to overjet, can be significantly altered by expansion and extraction procedures.

Purpose of the Study:

To investigate the relationship between maxillary arch expansion and changes in arch depth (overjet).
To quantify the reduction in maxillary arch depth after premolar (4\4) extraction with complete space closure.

Main Methods:

A typodont model of the maxillary arch was used to simulate expansion and premolar removal.
Arch dimensions, including arch depth, were meticulously recorded using a reflex microscope.

Main Results:

A direct linear relationship was established between the extent of maxillary arch expansion and the resulting reduction in arch depth.
Extraction of premolars resulted in a greater decrease in arch depth compared to the mesio-distal width of the extracted teeth.

Conclusions:

Maxillary arch expansion is a predictable method for reducing arch depth.
Premolar extraction in the maxillary arch leads to significant arch depth reduction, exceeding the space gained from tooth width alone, which must be considered in treatment planning.

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