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[Morphological study of open bite. Skeletal Class I and Class II open bite].

S Tanaka1

  • 1Department of Orthodontics, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.

Aichi Gakuin Daigaku Shigakkai Shi
|December 1, 1990
PubMed
Summary

This study quantifies morphological differences in Class I and II openbite cases, revealing key skeletal and dental factors contributing to openbite malocclusion. Findings highlight anterior facial height, mandibular plane angle, and alveolar bone as significant contributors.

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Area of Science:

  • Orthodontics
  • Craniofacial Morphology
  • Dental Anthropology

Context:

  • Openbite, a malocclusion characterized by a lack of vertical overlap between anterior teeth, presents complex etiological factors.
  • Understanding the specific morphological features of Class I and II openbite is crucial for effective diagnosis and treatment planning.

Purpose:

  • To quantitatively analyze and compare the craniofacial morphological characteristics of female patients with Class I and Class II openbite.
  • To identify distinct skeletal, dental, and alveolar contributing factors associated with each openbite classification across different age groups.

Summary:

  • Combined Class I and II openbite exhibited increased anterior facial height and a downward-sloping lower occlusal plane angle.
  • Primary openbite factors included molar over-eruption, vertical mandibular excess with significant alveolar bone, and specific differences in mandibular plane and lower occlusal plane angles between Class I and II.

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  • Class I openbite showed larger gonial angles, while Class II openbite involved backward and downward mandibular shifting, with early onset of skeletal and dental issues in younger patients.

    • Impact:

    • This research provides a detailed morphological basis for differentiating Class I and II openbite, aiding clinicians in tailoring treatment strategies.
    • The findings underscore the multifactorial nature of openbite, emphasizing the interplay of skeletal, dental, and alveolar components from early developmental stages.