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[Preliminary study on analysis method of spontaneous smile and application]
Yan-ling Zhang1, Hao Zhang, Wen-jie Hu
1Department of Periodontology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Summary
This study analyzed smile aesthetics in 99 Chinese Han-nationality females using high-definition digital photography and computer analysis. Average and high smile types were most common, with gingival display measuring 1.34 mm in high smile types.
Area of Science:
- Dentistry
- Facial Aesthetics
- Anthropometry
Background:
- Smile aesthetics are crucial in facial analysis.
- Understanding ethnic variations in smile characteristics is important for personalized dental treatments.
- Objective measurement techniques are needed to quantify smile elements.
Purpose of the Study:
- To investigate the smile esthetic elements of Chinese Han-nationality females.
- To establish an objective method for analyzing spontaneous smiles using digital imaging.
- To determine the prevalence of different smile types based on gingival display and lip-incisor distance.
Main Methods:
- A high-definition (HD) digital camera captured spontaneous smiles.
- Computer-image measuring techniques were employed to analyze smile components.
- Measurements included lip-incisor edge distance and gingival display in 99 Han-nationality females (aged 20-30).
Main Results:
- An objective method for spontaneous smile analysis was successfully established.
- Forty-three percent of subjects exhibited high or average smile types.
- Thirteen percent displayed a low smile type, with an average gingival display of 1.34 mm in the high smile group.
Conclusions:
- Average and high smile types are the most prevalent among the studied Chinese Han-nationality females.
- The developed objective method provides a reliable tool for smile esthetic analysis.
- Findings contribute to understanding ethnic-specific smile characteristics in dental esthetics.
