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Mostafa Sheikhi , Samira Asgari

Abstract

Today, smile esthetics are the primary concern of patients and orthodontists. Very limited studies have assessed the interactions between beauty variables. This study aimed to investigate the impact of the occlusal plane cant combined with midline axial deviation on smile attractiveness and determine the combined esthetic threshold of these two variables. The study was performed in a population in Zanjan, Iran. Frontal photos of a woman and a man with an ideal smile were downloaded from the Internet. Five images with different angles of cant and midline were produced using Photoshop software. Then, 240 laypersons commented on the images based on the Likert scale. Percentages and frequencies were used to describe the values. The highest percentage of treatment need was in a photo with a 10º midline axial deviation and a 0º cant, and the lowest treatment need was related to a photo with a 2.5º midline axial deviation and a 3º cant. The treatment needed for the female image was higher than for the male image. The esthetic threshold for combining the cant of the occlusal plane and midline axial deviation was about 2º of cant and 5º of midline deviation from the point of view of Zanjani people. In conclusion, the midline angle deviation was more important than the occlusal plane cant in smile esthetics.

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