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Mandibular incisor extraction: indications and long-term evaluation

J A Canut1

  • 1University of Valencia, Spain.

European Journal of Orthodontics
|October 1, 1996
PubMed
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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).

Related Experiment Videos

  • 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.