Comparison of pleasant and unpleasant smile characteristics in the perception of the laypeople in an Iranian population.

Autor: Motamedian SR; Department of Orthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Dentofacial Deformities Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Electronic address: DrMotamedian@gmail.com., Najary S; Students' Research Committee, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran., Nikakhtar H; Students' Research Committee, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran., Rezvani M; Students' Research Committee, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran., Safavi SM; Department of Orthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Dentofacial Deformities Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Jazyk: angličtina
Zdroj: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics [Am J Orthod Dentofacial Orthop] 2023 Dec; Vol. 164 (6), pp. 766-773. Date of Electronic Publication: 2023 Aug 09.
DOI: 10.1016/j.ajodo.2023.04.022
Abstrakt: Introduction: This study aimed to compare the characteristics of pleasant and unpleasant smiles from the perception of laypeople.
Methods: Two-hundred posed smile photographs were obtained from adult participants with no anomaly, restoration, or severe crowding and spacing in anterior teeth. Photographs were shown to 26 judges to give each photograph a score for attractiveness. Upper and lower quartiles for the most and least rated smiles were determined, and variables including gingival display, smile arc, midline deviation, buccal corridor, smile width, tooth rotation or malposition, diastema, upper and lower vermilion show, and tooth form were measured. Independent-sample t test and Pearson chi-square analysis were used to determine the differences between the pleasant and unpleasant groups for quantitative and qualitative variables, respectively. The linear regression model revealed variables with the most significant impact on the mean score.
Results: All quantitative and qualitative variables except tooth form significantly differed between pleasant and unpleasant smile groups (P <0.05). The consonant smile arc was associated with an increase of 12.59% in mean scores compared with the inconsonant smile arc. Each tooth reported with malposition was correlated with a decrease of 9.37% in the scores. In the same way, each 1-mm increase in midline diastema and occlusal cant coincided with a drop of 8.73% and 3.59% in scores, respectively.
Conclusions: The results of this study suggested that smile arc, tooth malposition, midline diastema, and occlusal plane canting had the most impact on smile esthetics and should be given priority by orthodontists in the treatment plan of choice.
(Copyright © 2023 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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