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[Comparative study on maxillo-facial components between human children and Japanese monkeys]
1Department of Pedodontics, Faculty of Dentistry, Tokyo Medical and Dental University.
Summary
Japanese children exhibit greater variation in maxillo-facial shape and occlusion compared to Japanese monkeys. This difference is linked to distinct mandibular and maxillary measurement correlations between the species.
Area of Science:
- Anthropology
- Comparative Anatomy
- Orthodontics
Background:
- Maxillo-facial morphology and occlusion vary significantly across species.
- Understanding developmental patterns in humans and non-human primates aids in identifying evolutionary and genetic influences.
Purpose of the Study:
- To investigate the causes of variation in maxillo-facial shape and occlusion in Japanese children (IIA stage).
- To compare these variations with those observed in Japanese monkeys (Macaca).
Main Methods:
- Utilized factor analysis on 17 cephalometric measurements from human children and Japanese monkey skulls.
- Compared human data (26 children, ~4.5 years) with monkey data (juveniles, subadults, adult females, adult males).
Main Results:
- Human children's maxillo-facial factors align with juvenile and female adult Macaca.
- Maxillary growth direction correlated with cranial base angle in humans.
- Mandibular measurements showed lower factor loading in humans than in Macaca, with less correlation to maxillary measurements.
Conclusions:
- Human occlusion and maxillo-facial shape display greater variation than in Macaca.
- Differences in mandibular-maxillary correlations suggest distinct developmental pathways influencing facial structure.