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

The morphologic basis for the extraction decision in Class II, division 1 malocclusions: a comparative study

S E Bishara1, D M Cummins, J R Jakobsen

  • 1Department of Orthodontics, College of Dentistry, University of Iowa, Iowa City.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|February 1, 1995
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

Development of an mRNA-specific real-time PCR for the detection of replicating cyprinid herpesvirus-3 (CyHV-3) in carp and non-target species.

Diseases of aquatic organisms·2026
Same author

Frontal fibrosing alopecia: survey of severity assessment methods in routine clinical practice and validation of the International Frontal Fibrosing Alopecia Cooperative Group measurement guidance.

Clinical and experimental dermatology·2021
Same author

Remodeling of muscle fibers approaching the human myotendinous junction.

Scandinavian journal of medicine & science in sports·2018
Same author

Composition and adaptation of human myotendinous junction and neighboring muscle fibers to heavy resistance training.

Scandinavian journal of medicine & science in sports·2016
Same author

Effects of oral habits' duration on dental characteristics in the primary dentition.

Journal of the American Dental Association (1939)·2002
Same author

Evaluation of nonrinse conditioning solution and a compomer as an alternative method of bonding orthodontic bracket.

The Angle orthodontist·2002

This study compared pretreatment dentofacial characteristics in Class II, Division 1 malocclusion patients. Lip protrusion and tooth-arch discrepancies influenced the decision for extraction versus nonextraction treatment.

Area of Science:

  • Orthodontics and Dentofacial Orthopedics
  • Cephalometric Analysis
  • Malocclusion Research

Background:

  • Class II, Division 1 malocclusions present unique diagnostic challenges.
  • Treatment decisions, including extraction, require careful consideration of dentofacial characteristics.
  • Understanding pretreatment factors can optimize treatment planning.

Purpose of the Study:

  • To compare pretreatment dentofacial features between Class II, Division 1 malocclusion patients treated with extraction versus nonextraction.
  • To identify specific cephalometric and dental parameters influencing the choice between extraction and nonextraction therapy.
  • To elucidate factors guiding orthodontic treatment decisions in complex malocclusions.

Main Methods:

  • Retrospective analysis of 91 Class II, Division 1 cases using lateral cephalograms.

Related Experiment Videos

  • Digitization of 24 cephalometric landmarks to derive 33 angular and linear measurements.
  • Comparison of cephalometric data between extraction and nonextraction groups, and with a control group of normal occlusion subjects.

    • Main Results:

    • Class II, Division 1 malocclusions typically exhibit increased overjet, overbite, ANB angle, mandibular retrusion, and a convex soft tissue profile compared to normal occlusion.
    • Patients selected for first premolar extractions showed significantly greater tooth size-arch length discrepancies in both arches.
    • Pretreatment lip protrusion (upper and lower in males, lower in females) was significantly higher in the extraction group.

    Conclusions:

    • Lip protrusion is a key factor influencing the decision to extract first premolars in Class II, Division 1 malocclusions.
    • Tooth size-arch length discrepancies are significant predictors for extraction in this patient cohort.
    • Cephalometric analysis aids in identifying specific patient characteristics that guide orthodontic treatment modality selection.