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Quantitative analysis of facial symmetry by using three-dimensional technology
Zhouqiang Wu1, Xiaolei Gao1, Hu Long1
1State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases and Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, No. 14, Section 3, Ren Min South Road, Chengdu, 610041, Sichuan, China.
Three-dimensional (3D) technology reliably quantifies facial asymmetry, with the chin and lateral mandible being key contributors. Non-expert evaluations showed moderate correlation with objective 3D symmetry measurements.
Area of Science:
- Orthodontics
- Facial analysis
- Biotechnology
Background:
- Facial symmetry is crucial in modern orthodontic treatment.
- Quantifying facial asymmetry is challenging due to unclear boundaries.
- Stereophotogrammetry offers advantages for precise facial asymmetry measurement.
Purpose of the Study:
- To quantify facial asymmetry using 3D technology.
- To assess the consistency between non-expert evaluations and 3D analysis of facial asymmetry.
Main Methods:
- Evaluated facial symmetry in 330 patients using 3D stereophotogrammetry.
- Compared objective 3D measurements with evaluations by 10 non-experts.
- Analyzed data using ROC curve and Pearson correlation analyses.
Main Results:
- Significant diagnostic values for asymmetry were found in lip, chin, cheek, and lateral mandible areas.
- Symmetry degree cut-off values ranged from 60% to 80%.
- Non-expert evaluations showed moderate correlation with whole-face symmetry degree.
Conclusions:
- The chin and lateral mandible significantly influence facial symmetry.
- Objective 3D technology provides a reliable method for measuring facial symmetry.
