A cephalometric evaluation of American Negro women.

A cephalometric study of forty American Negro women with an average age of 24.6 years and a Class I molar and/or canine relationship was performed. When measurements were compared to a control population of twenty Caucasian women, using several standard analyses, significant differences were demonstrated between the sample populations. 1. The maxilla and mandible were more protrusive in the Negro sample. 2. The upper and lower incisors were more proclined and the interincisal angle was more acute in the Negro sample. 3. Middle facial height was shorter and lower facial height was longer in the Negro sample. 4. The projection of the soft-tissue nasal tip was less in the Negro sample. 5. The projection of the upper and lower lips as related to the facial plane was greater in the Negro sample. 6. Lip thickness was approximately the same in the two groups.