This study analyzed the esthetics components of the smile, evaluating
the relationship between the curve formed by the incisal line of the
anterior superior teeth and the curve of the inferior lip, the touch of
this incisal line on the inferior lip, the teeth displayed during
smile, the relationship between the facial midline with the arch
midline, the location of the arch midline and gender differences.
Eighty-eight undergraduate students of the dentistry course of the
Tiradentes University were selected. Two photographs were taken
(smiling face and smile) using digital camera. The statistical analysis
was performed after image tracing evaluation. Results show that the
coincidence of the facial midline with the arch midline occurred only
on half of the students. Most of the students presented parallelism
between the incisal plan and the interpupillary line. Smiles with or
without touch of the incisal line on the lower lip, smiles revealing up
to the seconds premolars or firsts molars, and parallel or straight
smiles were also most commonly observed. The majority of the men
presented centered midline arch while women presented deviation to the
right. No difference was found between the distribution of the arch
midline
