Ying-Hui Chen1, Yi-Ling Cheng2, Hui Cheng3, Hao Yu4. 1. Postgraduate student, Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, PR China. 2. Resident, Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, PR China. 3. Professor and Deputy Dean, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, PR China; Professor, Fujian Biological Materials Engineering and Technology Center of Stomatology, Fuzhou, PR China. 4. Associate Professor, Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, PR China; Adjunct Associate Professor, Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. Electronic address: haoyu-cn@hotmail.com.
Abstract
STATEMENT OF PROBLEM: Various components of smile esthetics have been evaluated. However, whether these components affect smile esthetics in Han Chinese celebrities, dentists, and dental students is unknown. PURPOSE: The purpose of this study was to evaluate the smile esthetics of celebrities, dentists, and dental students in a Han Chinese population. MATERIAL AND METHODS: Frontal images of smiles were obtained from the Internet for the celebrity group, while images of dentists and dental students were collected for the dentist and dental student groups. The buccal and posterior corridor ratios, the alignment discrepancy between the commissural and interpupillary lines, the number of teeth revealed, the width ratio relative to the golden proportion, and the width-to-length ratios of maxillary anterior teeth were calculated by using a photo-editing software program. Statistical analysis was performed by using 2-way ANOVA and the Tukey HSD test (α=.05). RESULTS: Eligible images were obtained for 81 celebrities, 83 dentists, and 78 dental students. The celebrities were found to have the highest buccal and posterior corridor ratios and reveal the least teeth in the smile among the 3 groups (all P<.001). The alignment discrepancy for celebrities was significantly less than that for dental students (P=.025). Moreover, the absolute difference of width ratios from the golden proportion was significantly different from 0 for all groups (all P<.001). CONCLUSIONS: Significant differences were found in the smiles of Han Chinese celebrities, dentists, and dental students in regard to the buccal and posterior corridor ratios, the alignment discrepancy between the commissural and interpupillary lines, and the number of teeth revealed. Chinese celebrities tended to have a smile that displays to the second premolar, with a medium buccal corridor width.
STATEMENT OF PROBLEM: Various components of smile esthetics have been evaluated. However, whether these components affect smile esthetics in Han Chinese celebrities, dentists, and dental students is unknown. PURPOSE: The purpose of this study was to evaluate the smile esthetics of celebrities, dentists, and dental students in a Han Chinese population. MATERIAL AND METHODS: Frontal images of smiles were obtained from the Internet for the celebrity group, while images of dentists and dental students were collected for the dentist and dental student groups. The buccal and posterior corridor ratios, the alignment discrepancy between the commissural and interpupillary lines, the number of teeth revealed, the width ratio relative to the golden proportion, and the width-to-length ratios of maxillary anterior teeth were calculated by using a photo-editing software program. Statistical analysis was performed by using 2-way ANOVA and the Tukey HSD test (α=.05). RESULTS: Eligible images were obtained for 81 celebrities, 83 dentists, and 78 dental students. The celebrities were found to have the highest buccal and posterior corridor ratios and reveal the least teeth in the smile among the 3 groups (all P<.001). The alignment discrepancy for celebrities was significantly less than that for dental students (P=.025). Moreover, the absolute difference of width ratios from the golden proportion was significantly different from 0 for all groups (all P<.001). CONCLUSIONS: Significant differences were found in the smiles of Han Chinese celebrities, dentists, and dental students in regard to the buccal and posterior corridor ratios, the alignment discrepancy between the commissural and interpupillary lines, and the number of teeth revealed. Chinese celebrities tended to have a smile that displays to the second premolar, with a medium buccal corridor width.