A geometrical method to classify face forms.

Area of Science:

• Dental prosthetics and facial morphology analysis.

Background:

• Face form classification has been a cornerstone in prosthodontics for nearly a century, originating from Leon Williams' typal form theory.
• Traditional methods, including clinical and photographic assessments, classify face forms into categories like square, tapering, square tapering, and ovoid.
• Existing classification systems rely on subjective visual perception, necessitating the exploration of more objective analytical methods.

Purpose of the Study:

• To critically analyze current face form classification systems.
• To develop and validate a geometrical method for classifying face forms, aiming to reduce errors associated with subjective visual judgment.

Main Methods:

• Investigated 200 subjects aged 18-25 using both clinical face form indicators and photographic methods.
• Marked reference points on clinical indicators and photographs for precise face form classification.
• Employed a novel geometrical approach analyzing the angle of convergence in facial photographs to classify face forms, expanding existing typologies.

Main Results:

• A comparative analysis between clinical and photographic methods was conducted.
• No statistically significant differences were observed between face forms classified by clinical and photographic methods (p > .05).

Conclusions:

• A geometrical analysis of facial photographs offers an objective and effective alternative for face form assessment.
• This photographic geometrical method can mitigate the inherent subjectivity and errors present in conventional clinical visual judgment methods.