Objective: Aesthetic perception varies from person to person. It is accepted that personal experience and social environmental are influential on the aesthetic perception of the person. Various methods are used to apply aesthetic properties to the dentofacial structure. The most recent of these methods is the evaluation of the smile esthetic index (SEI) which was developed by Rotundo et al. The purpose of this study was to evaluate the smile aesthetics of patients by using SEİ in Van Yuzuncu

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... University Faculty of Dentistry. Material and Methods: A total of 100 patients, 50 female and 50 male, were included in this study. The smile aesthetics were evaluated according to the criteria of SEI on the photographs taken from the patients. Results: According to the results obtained, men's SEI scores were found to be higher than women, although not statistically significant. There was no statistically significant difference between the age groups in terms of SEI score. Mean SEI score of a total 100 individuals participating in this study was calculated as 6.545 in this study. Factors that are most frequently encountered by the individuals participating in this study and which negatively affect aesthetics were; absence of the correct facial midline, correct toot/crown alignment, existence of visible diastema and interdental papillary loss. Conclusion: SEI is a clinically applicable index that evaluates soft and hard tissues together and most importantly reveals objective values. This is the first study in the literature SEI with clinically applied, comparing male-female and age-group assessments. It should be considered that smile aesthetics is an important factor and it is thought that further literature study is needed.