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Related Experiment Videos

Arch dimensional changes during and following fixed appliance therapy.

K K Ho1, W J Kerr

  • 1Glasgow Dental Hospital and School.

British Journal of Orthodontics
|November 1, 1987
PubMed
Summary

Fixed appliance orthodontic treatment with four premolar extractions generally reduced arch dimensions. However, intercanine width briefly expanded during treatment, with varying post-treatment stability in maxillary and mandibular arches.

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Area of Science:

  • Orthodontics
  • Dental Arch Dimensions
  • Craniofacial Development

Background:

  • Orthodontic treatment often involves tooth extractions to manage crowding and improve occlusion.
  • Understanding changes in dental arch dimensions is crucial for predicting treatment outcomes and stability.

Purpose of the Study:

  • To investigate the changes in dental arch dimensions following orthodontic treatment with fixed appliances and four premolar extractions.
  • To analyze the dimensional stability of the dental arches post-treatment.

Main Methods:

  • Retrospective analysis of dental casts from 23 subjects.
  • Measurements taken using the Reflex Metrograph.
  • Evaluation of arch dimensions during and after treatment.

Main Results:

  • A general reduction in mean arch dimensions was observed during and after treatment.
  • Intercanine width showed a slight expansion in both arches during treatment.
  • Post-treatment, intercanine width reduction occurred in the mandibular arch but was maintained in some maxillary cases.

Conclusions:

  • Fixed appliance therapy with premolar extraction typically leads to arch dimension reduction.
  • Intercanine width changes are complex, with transient expansion and variable post-treatment stability.
  • Maxillary intercanine width may show better long-term stability compared to the mandibular arch after this treatment protocol.

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