A relação da projeção do terço inferior da face com a região da glabela

Abstract

Linhares DS. The relation between the projection of the lower third of the face and the region of the glabella [dissertation]. São Paulo: Universidade de São Paulo, Faculdade de Odontologia; 2017. Versão Corrigida.The lower third of the face exerts a strong influence on the aesthetics of individuals, and knowing the importance of its balance, and the orthodontist's contribution to the diagnosis of the facial profile, the present study had the purpose to test a method of correlation between a linear measure located from the glabella region with linear anteroposterior measurements on the lower third of the face (Triviño, 2012), and verify the predictability of anteroposterior proportions in the lower third of the face, from a reference line through a point in the glabella region. Anatomical tracings from lateral cephalometric radiographs of 120 individuals with balanced profile, leucoderm and class I were performed in order to establish cephalometric parameters to correlate anteroposterior references of the lower third of the face from the lines Sv-PRT and PRTv, obtained through the PRT point. The applicability of the method was performed in a group of 24 individuals with an unpleasant profile, in which it considered the predictability formulas that used the Sv-PRT line as an unsatisfactory reference to determine the anteroposterior proportions of the lower third of the face in some patients. The method that considered the PRTv line as a reference, using Pearson's statistical methods of correlation and multiple linear regression, presented statistically significant results for all reference values in females and males (PRTv-Ls, PRTv -Li and PRT-Pg'). The Student t-test was used to verify that the measures were not statistically significant according to gender. The results of this study showed that it is coherent to consider the glabella region as an evaluation and diagnostic reference for the anteroposterior proportions of the lower third of the face.