Predictability of ANB and 1-NA values from Steiner cephalometric analysis

Maria Fernanda MARTINS-ORTIZ, Arnaldo PINZAN, Célia PINZAN, Décio Rodrigues MARTINS

The purpose of our study was to verify in the beginning, at the end of treatment, and approximately 5 years posttreatment, the predictability of the estimated values for ANB and 1-NA during treatment planning when using the Steiner analysis. The sample consisted of 149 caucasian patients, descending on spaniards, italians and portuguese, from the Bauru county, with Class I or II malocclusions, who had undergone Edgewise therapy with and without extraction of four premolars. The sample was divided in three groups according to the facial pattern: horizontal (27 patients), balanced (79 patients) and vertical (43 patients), matched by age. According to the methodology used the results showed that there was correlation between the facial pattern and ANB, but no correlation with the behavior of 1-NA; the estimated ANB was statistically different compared to the end of treatment and 5 years posttreatment, except for the vertical group. The estimated values for 1-NA where statistically different compared to the end of treatment and 5 posttreatment in all three groups; the 1-NA value raised significantly with age. The error of the estimated values for ANB and 1-NA are not very relevant clinically, therefore they could still be used as long as they remain as a flexible tool and not a strict parameter.

Keywords: Cephalometrics. Steiner analysis. ANB. 1-NA.

Saturday, November 23, 2024 09:11