0.729Number of fixations atleft eye1.74(±0.984)A1.40(±0.707)A1.71 (±0.938)A1.48 (±0.712)A1.58 (±0.683)A1.26 (±0.514)A0.166* Statistically significant at α=0.05Superscript letters, values with the same letters in the superscript among observers, do not differ significantly (p> 0.05)The number of fixations on the AOI of the mentonfeatured statistically significant differences when theimage of the group with 0° female was compared toimages of the groups with 2° male and 2.5° female.(p<0.05).(Table/Fig 5) The number of fixations on theAOI of the eyes did not present statistically significantdifferences for any magnitude of the occlusal plane(p>0.05).DISCUSSIONPhotographs are the most common way of diagnose rotation in the occlusal plane, and is a important resource of study for smile esthetics. Rotation of the occlusal plane canting usually is a complex treatment because can cause additional asymmetry during orthodontic treatment and uncertain stability of treatment[8,13]..The objective this study was to evaluate smile estheticsof the occlusal plane cant via tracking by laypeople. In the current study, experts including prosthetists, periodontists, and orthodontists could have been included because they are more directly linked to esthetic rehabilitation, but only laypeople were requested to assess the images. Laypeople do not have any specific technical knowledge about the arrangement and disposition of the smile and are the most important group because their opinion is the guiding force for changing esthetic evaluation patterns .The occlusal plane of 2.0° was evaluated as estheticallyacceptable and was not perceived by orthodontists,general dentists, and laypersons . Indeed, KokichVG et al., determined that laypersons did not detectthis type of asymmetry unless it reached a 4ºinclination .These findings indicate that laypeople and generalpractitioners consider the occlusal plane cant moreacceptable than orthodontists, denoting thatthecategory of observer affected the way smile esthetics isperceived when a rotation of the occlusal plane is4
presented.This is contrary to the results of Padwa BL etal., suggesting that during clinical examination, thedifferences in detection of the occlusal planeangulation depended on the degree of rotation and notbased on the experience of the observers in analyzingsmile . In the current study, according to theheatmap and scanpath (qualitative results), laypeoplewere not able to observe differences in any of thecanting of the occlusal plane between 0º and 2.5º, evenwhen the quantitative results exhibited statisticallysignificant differences. The differences were prominenton the magnitude of 0º when compared to themagnitude of 2.5º for the female and 2.0º for the maleas well as for the magnitude of 2.5º between sexes,although the results show that the higher themagnitude, the smaller number of fixations. Inconsidering qualitative analysis, we can confirm thatthe raters were not able to perceive the occlusal planecant.