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Mandibular incisor extraction: indications and long-term evaluation

¹University of Valencia, Spain.

European Journal of Orthodontics

|October 1, 1996

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Extracting a single lower incisor can improve alignment in cases of crowding and crossbites. This orthodontic treatment offers stable results, outperforming premolar extraction for lower anterior teeth alignment.

Area of Science:

Dentistry
Orthodontics
Dental Arch Analysis

Background:

Single lower incisor extraction is a treatment option for specific malocclusions like crowding, supernumerary teeth, and anterior crossbites.
Assessing the long-term stability of lower anterior teeth alignment after incisor extraction is crucial for orthodontic treatment planning.

Purpose of the Study:

To evaluate the long-term stability of lower anterior teeth alignment following the extraction of a single lower incisor.
To compare the stability of alignment after incisor extraction with outcomes from premolar extraction cases.

Main Methods:

A retrospective study of 26 patients who underwent single lower incisor extraction.
Analysis of dental casts at three time points: initial treatment (T1), post-retention (T2), and 5-8 years out of retention (T3).

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Measurement of dental crowding and Little's Irregularity Index to quantify alignment changes.

Main Results:

Mean crowding significantly reduced from 3.86 mm at T1 to 1.49 mm at T3, showing a net improvement of 2.37 mm.
Little's Irregularity Index improved from 6.44 at T1 to 2.53 at T3, indicating a net improvement of 3.91.
Observed alignment stability appeared superior to that typically seen after premolar extractions.

Conclusions:

Single lower incisor extraction provides a stable improvement in lower anterior teeth alignment for selected cases.
The stability achieved suggests this approach may be a favorable alternative to premolar extraction in specific orthodontic scenarios.
Further research comparing long-term outcomes of different extraction patterns is warranted.