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Related Experiment Videos

Method for quantifying facial asymmetry in three dimensions using stereophotogrammetry

F Ras1, L L Habets, F C van Ginkel

  • 1Department of Orthodontics, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.

The Angle Orthodontist
|January 1, 1995
PubMed
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This study introduces a 3D stereophotogrammetry method to quantify facial asymmetry. The Exocanthion landmark plane proved most effective for analyzing facial asymmetry in individuals, including those with cleft lip and palate.

Area of Science:

  • Craniofacial surgery
  • Medical imaging
  • Biomechanical analysis

Background:

  • Facial asymmetry is a common concern in craniofacial surgery.
  • Quantifying facial asymmetry accurately is crucial for treatment planning and outcome assessment.
  • Existing methods may lack precision or comprehensive 3D analysis.

Purpose of the Study:

  • To introduce and validate a novel three-dimensional (3-D) method for quantifying facial asymmetry.
  • To identify the most reliable reference plane for assessing facial asymmetry using stereophotogrammetry.
  • To evaluate the method's applicability in individuals with operated complete unilateral cleft lip and palate.

Main Methods:

  • Stereophotogrammetry was used to capture 3-D coordinates of facial landmarks in 106 individuals.

Related Experiment Videos

  • Four reference planes were defined based on bilateral landmarks of the eyes, nose, and mouth.
  • Multivariate analyses of variance (MANOVA) were employed to compare asymmetry across reference planes.

    • Main Results:

    • A significant difference (P < 0.01) in asymmetry quantification was found across the four reference planes.
    • The reference plane perpendicular to and bisecting the line between Exocanthion landmarks demonstrated the highest reliability.
    • The method showed high reproducibility and validity for quantifying facial asymmetry.

    Conclusions:

    • The proposed 3-D stereophotogrammetry method offers a reliable approach to quantify facial asymmetry.
    • The Exocanthion landmark-based reference plane is recommended for future studies on facial asymmetry.
    • This technique can aid in objective assessment and management of craniofacial asymmetry, particularly in cleft lip and palate patients.