Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Cephalometric A point changes during and after maxillary protraction and expansion

S Shanker1, P Ngan, D Wade

  • 1Section of Orthodontics, College of Dentistry, Ohio State University, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|October 1, 1996
PubMed
Summary

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Publisher Correction: Muscle abnormalities in Long COVID.

Nature communications·2025
Same author

Reply: Muscle abnormalities in Long COVID.

Nature communications·2025
Same author

Rapidly rising cases with Omicron in Senegal.

New microbes and new infections·2022
Same author

First detection of SARS-CoV-2 variant B.1.1.7 in Senegal.

New microbes and new infections·2021
Same author

Letter to the Editor.

International endodontic journal·2020
Same author

A response to a Letter to the Editor re: Improving Continuing Professional Development opportunities for radiographers: A single centre evaluation.

Radiography (London, England : 1995)·2017

Maxillary protraction therapy significantly advances the A point in children with Class III malocclusions, primarily through skeletal changes. This early treatment shows stable results 12 months post-therapy.

Area of Science:

  • Orthodontics
  • Craniofacial Development
  • Pediatric Dentistry

Background:

  • Class III malocclusion is characterized by maxillary deficiency.
  • Maxillary protraction therapy aims to correct this by advancing the maxilla.
  • Understanding treatment-induced changes is crucial for effective intervention.

Purpose of the Study:

  • To analyze skeletal and local maxillary changes following maxillary protraction therapy in Class III malocclusions.
  • To compare treatment effects with an untreated control group.
  • To assess the stability of these changes post-treatment.

Main Methods:

  • Cephalometric analysis of 25 Chinese children with Class III malocclusions treated with maxillary protraction.
  • Comparison with an age and sex-matched untreated control sample.

Related Experiment Videos

  • Maxillary superimposition technique to differentiate skeletal and local contributions to A point changes.

    • Main Results:

    • Maxillary protraction resulted in a mean A point advancement of 2.4 mm versus 0.2 mm in controls.
    • Skeletal maxillary advancement accounted for 75% of the A point change.
    • Less downward A point movement was observed with treatment; no significant horizontal or vertical differences post-treatment.

    Conclusions:

    • Maxillary protraction therapy effectively advances the maxilla in Class III malocclusions, with a significant skeletal component.
    • The observed changes are stable 12 months after early treatment.
    • Force direction may influence vertical changes at the A point.