![]() ![]() This is most likely attributable to the increased overbite in these subjects. Moreover, the highest frequency of parallel smile line was observed for the Class II Division II subjects. The authors of the present study then further confirm the concept that the beauty of smile is independent of the intermaxillary relation. In accordance to the standpoint of Dawson, no statistically significant association was found between the different smile line types and Angle occlusal classification. Parallel smile line tends to turn into straight and even reverse smile lines with age due to the reduced tonicity of the lip muscles and physiological wear of teeth. have not specified any age limit in its inclusion criteria. While the present study included only 20-30 years old volunteers, the study of Dong et al. The difference between the frequency values of the two studies is most likely to be the result of the different age ranges used in the present study. reported these values to be 60%, 34%, and 5%, respectively. The straight and reverse smile lines were observed in 21.2% and 6.6% of the volunteers, respectively. In the present study, 72.2% of the study population had a parallel smile line. The present study was aimed to assess the effect of occlusal parameters on smile line. One of the shortcomings of the smile literature is lack of evidence regarding the association of occlusal factors, including but not limited to Angle molar classification, presence of anterior or posterior cross bite, overjet and overbite, etc, with the smile line. Although these assessments clearly show the tendency towards better understanding of the smile and its related factors, dental profession has nonetheless not achieved sufficient evidence for clinical setting application. Also, the maximum smile line position has been proposed as the most reproducible and comparable quantitative reference for clinical decision making in esthetic restoration of the smile anatomy. Smile line, dental midline, tooth display, negative spaces, dental proportions, and symmetry stand are among the most important criterion discussed. Furthermore, authors have proposed methods to visualize ideal smile specifically for each individual based on the literature. Dynamic video recording of spontaneous smile have been proposed to the more advantageous in this regard than the posed smile recordings. These include the effect of vertical dimension and factors like gender on smile height, the display of teeth upon spontaneous and posed smiling according to the position of the lip line, photographic analysis of the smile, the characteristics of the smile in a population of normally looking people, etc.Īuthors have suggested diagnostic implications of reduced lip-line height, tooth display, and smile width while posed smiling, in a more reliable estimation of lip-line height, smile arc, buccal corridors, and plane of occlusion. Several aspects of smile esthetics and its influencing factors have been already discussed. They also mentioned that in an average smile the incisal curve of the maxillary teeth should be parallel to the inner curvature of the lower lip. ![]() described an “average smile” as one that exhibits the full clinical crown of the six maxillary anterior teeth and also the premolars from frontal view. ![]() They defined the smile line as “the harmony between the curvature of the incisal edges of the maxillary anterior teeth and the upper border of the lower lip.” Hulsey highlighted the importance of the congruency of the curvatures of the upper border of the lower lip and the incisal edge of the maxillary incisor to obtain an attractive smile. The concept of smile line was first discussed by Frush and Fisher in 1985 and revisited by Jameson in 2002. Many investigators have therefore tried to find out the secret behind the impact of a beautiful smile. The effect of attractive smile on positive self-image has been discussed to be even more than that of the physical attractiveness stereotype. ![]()
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