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Perceptions of midline deviations among different facial types.

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American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
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Area of Science:

  • Dentistry and Orthodontics
  • Facial Aesthetics
  • Psychophysics

Background:

  • Midline deviations in dentistry can complicate treatment.
  • Determining acceptable thresholds for midline deviation is crucial.
  • Factors influencing perception of midline deviation require investigation.

Purpose of the Study:

  • To assess how facial types affect laypersons' perception of midline deviations.
  • To quantify acceptable limits of midline deviation based on facial morphology.

Main Methods:

  • Generated 3 facial types (euryprosopic, mesoprosopic, leptoprosopic) with midline deviations from 0.0 to 4.0 mm.
  • Collected ratings from 160 laypersons on attractiveness and acceptability.
  • Analyzed data considering facial type and sex.

Main Results:

  • Overall acceptable midline deviation threshold was 2.92 ± 1.10 mm.
  • Euryprosopic facial types tolerated deviations ≥2 mm without reduced attractiveness.
  • Male subjects showed lower tolerance thresholds than female subjects, with attractiveness affected at 1 mm for females versus 2 mm for males.

Conclusions:

  • Facial type and sex significantly impact the detection and acceptability thresholds for midline deviations.
  • Euryprosopic facial types and male sex are associated with higher attractiveness ratings at smaller deviations.
  • These findings are critical for orthodontic treatment planning and aesthetic evaluations.