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Residual lower first premolar extraction space.

M E Richardson1

  • 1Orthodontic Department, School of Dentistry, Belfast.

British Journal of Orthodontics
|August 1, 1990
PubMed
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Many patients retain residual spaces after lower first premolar extraction. This study investigated factors influencing space closure, finding that 40% of sites had persistent gaps, averaging 0.62-0.71 mm.

Area of Science:

  • Dentistry
  • Orthodontics
  • Dental Morphology

Background:

  • Residual extraction spaces in the lower arch can impact occlusal stability and aesthetics.
  • Understanding factors influencing space closure is crucial for effective orthodontic treatment planning.

Purpose of the Study:

  • To investigate the prevalence of residual lower first premolar extraction spaces five years post-extraction.
  • To identify potential factors contributing to the non-closure of these spaces.

Main Methods:

  • Analysis of 43 subjects (16 male, 27 female) five years after lower first premolar extraction.
  • Measurement of residual space, buccal and incisal space conditions (pre-extraction models), and alveolar atrophy (final models).
  • Cephalometric analysis (60° and 90°) to assess angulation of teeth and changes in incisor position.

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Main Results:

  • Forty percent of extraction sites exhibited residual spaces, averaging 0.62 mm (left) and 0.71 mm (right).
  • Various parameters including initial space conditions, alveolar atrophy, and tooth angulation were assessed for correlation with non-closure.
  • Changes in tooth angulation and incisor position were evaluated using serial cephalometric superimpositions.

Conclusions:

  • A significant percentage of lower first premolar extraction sites remain open five years post-treatment.
  • Further research is needed to definitively establish the parameters influencing the non-closure of these residual spaces.