[Is the ethnic factor an orthodontic therapeutic instructor?]

Area of Science:

• Orthodontics
• Anthropology
• Facial Aesthetics

Background:

• Societal perceptions of beauty are often ethnically stereotyped.
• Traditional cephalometric norms are based on North American Caucasian samples.
• Existing norms may not be universally applicable across diverse populations.

Purpose of the Study:

• To question the universal application of Caucasian-based cephalometric norms.
• To investigate ethnic variations in facial aesthetics.
• To advocate for ethnicity-specific orthodontic diagnostic criteria.

Main Methods:

• Cephalometric analyses of untreated Afro-American and Asian subjects with normal occlusions.
• Comparison of esthetic criteria between different ethnic groups and Caucasian North Americans.
• Evaluation of skeletal and cutaneous facial profiles within Asian subgroups (Japanese, Chinese, Korean).

Main Results:

• Afro-Americans and Asians exhibit distinct facial characteristics, including bimaxillary alveolo-dental protrusion and reduced naso-labial angles.
• Afro-Americans often present with anterior maxillae and variable mandibular positions.
• Asian skeletal profiles show variations: Japanese with retruded maxillae, Chinese with protruded maxillae and retruded mandibles, and Koreans similar to Japanese.

Conclusions:

• Caucasian-based cephalometric norms are insufficient for accurate orthodontic diagnosis in diverse populations.
• Establishing ethnicity-specific facial characteristic data is crucial for orthodontics.
• Tailoring esthetic diagnoses to a patient's ethnic origin ensures appropriate orthodontic treatment.