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Relationship between skeletal Class II and Class III malocclusions with vertical skeletal pattern.

Sonia Patricia Plaza1, Andreina Reimpell1, Jaime Silva1

  • 1Fundación Centro de Investigación y Estudios Odontológicos - UniCIEO, Departamento de Ortodoncia (Bogotá, Colombia).

Dental Press Journal of Orthodontics
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Summary

This study links vertical skeletal patterns to Class II and Class III malocclusions. Hyperdivergence is associated with Class II, while hypodivergence is linked to Class III, indicating skeletal compensation mechanisms.

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Area of Science:

  • Orthodontics and Dental Anthropology
  • Cephalometric Analysis
  • Skeletal Malocclusion Research

Background:

  • Understanding the interplay between sagittal and vertical skeletal patterns is crucial for diagnosing and treating malocclusions.
  • Previous research has explored these relationships, but further clarification on specific cephalometric contributions is needed.

Purpose of the Study:

  • To establish the association between sagittal and vertical skeletal patterns.
  • To identify cephalometric variables predicting the development of skeletal Class II or Class III malocclusion.

Main Methods:

  • Cross-sectional study of 548 pre-treatment lateral cephalograms (aged 18-66).
  • Sagittal pattern assessed using ANB angle, Wits, and App-Bpp; vertical pattern by SN-Mandibular plane angle.
  • Statistical analysis included Chi-square, ANOVA/Kruskal-Wallis, and ordinal multinomial regression.

Main Results:

  • Significant association found between sagittal and vertical skeletal patterns (p<0.05).
  • Hyperdivergent patterns were more common in Class II malocclusion; hypodivergence was prevalent in Class III.
  • Hyperdivergence, maxillary prognathism, and mandibular retrognathism increased Class II risk. Maxillary retrognathism and mandibular prognathism increased Class III risk.

Conclusions:

  • A clear relationship exists between vertical skeletal patterns and Class II/III malocclusions.
  • Skeletal compensation mechanisms appear to play a role in both vertical and sagittal discrepancies.