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Related Experiment Video

Updated: May 20, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
07:32

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

Posttreatment and physiologic occlusal changes comparison.

Karina Maria S Freitas1, Guilherme Janson, Bryan Tompson

  • 1Department of Orthodontics, Ingá Dental School, Maringá, Paraná, Brazil. kmsf@uol.com.br

The Angle Orthodontist
|July 18, 2012
PubMed
Summary

Orthodontic treatment, particularly with extractions, leads to greater occlusal changes than natural development. Both treated groups experienced more significant maxillary changes, with extraction cases showing increased mandibular crowding post-treatment.

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Area of Science:

  • Orthodontics
  • Dental Development
  • Occlusal Analysis

Background:

  • Orthodontic treatment aims to correct occlusal irregularities.
  • Understanding long-term occlusal stability after treatment is crucial.
  • Comparing treatment outcomes with natural occlusal development provides valuable insights.

Purpose of the Study:

  • To compare posttreatment and postretention occlusal changes in orthodontic patients with natural occlusal development.
  • To evaluate changes in treated subjects (extraction and nonextraction) versus untreated subjects.

Main Methods:

  • Three groups were studied: premolar extraction (n=97), nonextraction (n=58), and untreated (n=114).
  • Dental casts were analyzed using the Peer Assessment Rating (PAR) index and Little irregularity index.

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Last Updated: May 20, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
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  • Occlusal changes were assessed over time (posttreatment and postretention) and compared between groups.

    • Main Results:

    • Treated groups had lower PAR and Little indexes initially compared to untreated subjects.
    • Over the observation period, treated groups showed greater increases in maxillary PAR and Little indexes.
    • The extraction group exhibited a larger increase in the mandibular Little index compared to the untreated group.

    Conclusions:

    • Orthodontic treatment, especially with extractions, results in more significant occlusal changes than natural development.
    • Maxillary occlusal changes were more pronounced in treated groups.
    • Mandibular anterior crowding changes were greater in the extraction group post-treatment than in untreated individuals.