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Morphometric relationships between tooth and face shapes.

H-B Lindemann1, C Knauer, P Pfeiffer

  • 1Department of Prosthetic Dentistry, School of Oral Medicine, University of Cologne, Cologne, Germany.

Journal of Oral Rehabilitation
|September 25, 2004
PubMed
Summary
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The study found that while face shape is often used to select artificial teeth, the relationship is not proven. Maxillary central incisor shapes vary more than face shapes, with women

Area of Science:

  • Dental prosthetics
  • Anthropometry
  • Biometrics

Background:

  • Facial morphology is commonly used as a reference for selecting maxillary central incisor shapes in edentulous patients.
  • The scientific validity of this commonly used relationship has not been definitively proven.
  • This study investigates the correlation between facial form and maxillary incisor shape.

Purpose of the Study:

  • To determine if a relationship exists between the shapes of maxillary central incisors and facial forms.
  • To quantitatively assess the degree of similarity between facial shapes and dental shapes.
  • To evaluate the reliability of using facial shape as a predictor for maxillary incisor shape.

Main Methods:

  • Collected dental casts from 100 subjects (50 men, 50 women) and standardized digital photographs of their faces.

Related Experiment Videos

  • Utilized Hausdorff distance (HDD) to quantitatively compare the shapes of maxillary central incisors with facial forms.
  • Employed non-parametric Mann-Whitney U and Kruskal-Wallis tests for statistical analysis of shape comparisons.

    • Main Results:

    • Facial shape measurements from the chin to the eyebrow line showed a significantly better match with incisor shapes than measurements from chin to hairline (P < 0.0001).
    • Maxillary central incisors exhibited significantly higher shape variability (0.084 +/- 0.028) compared to facial shapes (0.045 +/- 0.015), a factor of 1.9 difference.
    • Women's maxillary central incisor shapes demonstrated a statistically significant smaller Hausdorff distance (HDD) compared to men's (P < 0.0001).

    Conclusions:

    • The direct correlation between face shape and maxillary central incisor shape is weak, suggesting current methods may be unreliable.
    • Maxillary incisor shapes possess greater inherent variability than facial shapes, indicating a need for individualized selection criteria.
    • Gender influences the relationship between facial and maxillary incisor morphology, with women showing closer shape correlations.