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Related Experiment Videos

First or second premolar extraction effects on facial vertical dimension.

Tae-Kyung Kim1, Jong-Tae Kim, James Mah

  • 1Department of Orthodontics, College of Dentistry, Seoul National University, Seoul, South Korea.

The Angle Orthodontist
|April 14, 2005
PubMed
Summary

Premolar extraction in hyperdivergent Class I malocclusion does not decrease facial vertical dimension (FVD). Second premolar extraction resulted in more molar mesial movement but did not significantly alter FVD compared to first premolar extraction.

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Area of Science:

  • Orthodontics
  • Dentofacial Orthopedics
  • Cephalometric Analysis

Background:

  • The "wedge effect" concept suggests mesial molar movement can reduce facial vertical dimension (FVD).
  • Investigating premolar extraction's impact on FVD in hyperdivergent Class I malocclusion is crucial.
  • Understanding molar movement and FVD changes based on extraction timing (first vs. second premolar) is important.

Purpose of the Study:

  • To compare the mesial movement of molars and changes in FVD between first premolar (P1) and second premolar (P2) extraction groups.
  • To evaluate the validity of the hypothesis that P2 extraction reduces FVD by minimizing the wedge effect in hyperdivergent facial types.

Main Methods:

  • Retrospective cephalometric analysis of 54 Class I hyperdivergent malocclusion patients.

Related Experiment Videos

  • Group 1: 27 patients with maxillary and mandibular P1 extractions.
  • Group 2: 27 patients with maxillary and mandibular P2 extractions. Statistical analysis included paired and independent t-tests.

    • Main Results:

    • Second premolar (P2) extraction group showed significantly more mesial movement of maxillary and mandibular first molars compared to the first premolar (P1) group.
    • Both groups exhibited increased anterior facial height, but no significant differences in overall angular or proportional FVD measurements were found between pre- and post-treatment.
    • No statistically significant difference in FVD change was observed between P1 and P2 extraction groups, except for minor changes in specific angular measurements.

    Conclusions:

    • The hypothesis that second premolar (P2) extraction reduces facial vertical dimension (FVD) in hyperdivergent facial types by reducing the wedge effect is invalid.
    • Neither first (P1) nor second (P2) premolar extraction significantly decreases FVD in hyperdivergent Class I malocclusion.
    • Orthodontic treatment involving P1 or P2 extractions in this patient cohort does not lead to a reduction in facial vertical dimension.