features statistically significant differences in relation to the occlusal plane cant when the image of the group with 0° female was compared to the group of 2.5º female (p<0.05). The occlusal plane cant presented statistically significant differences when the image of the group 0° female was compared to the group of 2º male.(p<0.05)(Table/Fig 5). The number of fixations on the AOI of the eyes did notpresent statistically significant differences for anymagnitude 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 imperative for evaluating the ever changing esthetic patterns .The occlusal plane of 2° was evaluated as estheticallyacceptable and was not perceived by orthodontists,general dentists, and laypersons . Indeed, KokichVO et al., concluded that laypersons were unable todetect this kind of asymmetry until it reached a 4ºinclination .These findings indicate that laypeople and generalpractitioners consider the occlusal plane cant more4
acceptable than orthodontists, denoting thatthecategory of observer affected the way smile esthetics isperceived when a rotation of the occlusal plane ispresented.On the contrary, Padwa BL et al. suggestedthat the differences 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 2º for the male aswell 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.