Cephalometric standards for white Brazilians.

Lateral cephalometric radiographs were obtained from 30 individuals that were equally divided into groups by gender. Their ages varied from 18 to 31 years. All were white Brazilians with normal dental occlusions and good facial profiles. A combination of angles and linear measurements from Steiner's and Downs' analyses were determined. Means and standard deviations were calculated for the sample. Student's t test did not show a statistically significant difference between men and women. The entire sample was compared with the North American standards reported by Steiner and Downs. Statistically significant differences were found for GoGn/SN and SND angles. The statistically greater values of 1/NA(mm), 1/NB(mm), and 1/NA(degrees) for the Brazilians indicate typical morphological aspects with protrusive incisors. These differences and the great variation within the sample should be taken into account when formulating an orthodontic treatment plan for Brazilians.