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Malocclusions in Xia Dynasty in China.
Wei Wang1, Xiang-Long Zeng, Cheng-Fei Zhang
1Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China. wangwei9196@sina.com
Chinese Medical Journal
|February 21, 2012
Summary
Malocclusion prevalence in China
Area of Science:
- Paleodontology
- Anthropology
- Orthodontics
Background:
- Modern malocclusion rates in China are significantly higher than in ancient populations.
- Juvenile malocclusion affects up to 72.92% of children in China.
- This study investigates Xia Dynasty malocclusion prevalence for historical comparison.
Observation:
- Examined 38 male and 18 female Xia Dynasty skulls (4000 years old).
- Analyzed 86 dental arches for jaw relationships, tooth crowding, diastema, and malposition.
- Assessed individual tooth alignment and overall malocclusion.
Findings:
- 27.6% of Xia Dynasty samples exhibited malocclusion, primarily Angle Class I.
- Tooth alignment issues, including crowding (8.1%) and diastema (9.3%), were observed.
- Individual tooth malposition occurred in 5.8% of the ancient samples.
Implications:
- Malocclusion prevalence remained stable from the Neolithic to the Xia Dynasty.
- Xia Dynasty malocclusion rates were substantially lower than contemporary Chinese populations.
- Suggests environmental or lifestyle factors influence modern malocclusion development.
