Evaluation of Smile Characteristics of Attractive Smile in Various Growth Patterns

Abstract

Objective: To investigate the dynamic aspect of attractive smile and smile parameters in different growth patterns. Methods: Participants ranging in age from 17 to 25 years were randomly selected and videographic records of smile were obtained. A panel of two orthodontists, two prosthodontists, and two laypersons were involved in the selection of attractive smile. Inter-examiner variability was also assessed. The final sample of 84 participants with attractive smile were grouped into three categories based on clinical FMA into average, horizontal, and vertical growth pattern. Upper lip length = ULL-R, Lower lip length = LLL-R were measured on rest photographs. Upper lip length = ULL-S, Lower lip length = LLL-S, Upper lip thickness = ULT, Lower lip thickness = LLT, Maxillary incisal display = MID, Interlabial gap = ILG, Outer inter commissural width = ICW, Buccal corridor space = BC were measured on smile photographs. Pearson’s Chi-square test was done for the perception of attractiveness of smile. Differences among the three groups was subjected to one-way analysis of variance and Tukey’s post hoc test. Results: Highly significant correlation was observed among orthodontists, prosthodontists, and laypersons in assessing attractiveness of smile. Vertical parameters such as upper lip length at rest, upper lip length during smile, lower lip length at rest, lower lip length during smile, and lower lip thickness (LLT) were significantly increased in the vertical pattern when compared with the average and horizontal growth pattern, whereas buccal corridor space was the least in horizontal growth pattern. Conclusion: Growth patterns appear to have an influence on perception of smile esthetics and smile parameters. This suggests that care should be taken while framing treatment goals considering the significant differences among growth patterns. Strong correlation was observed among orthodontists, prosthodontists, and laypersons in assessing attractiveness of smile. ULL-R, ULL-S, LLL-R, LLL-S, and ΔULL show a significantly higher value in vertical growth pattern when compared to average and horizontal growth pattern. The buccal corridor space (BC) among the participants was the least in horizontal growth pattern.