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Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment

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Published on: February 23, 2024

Shape variation in modern human upper premolars.

Petra G Šimková^1,2, Lisa Wurm³, Cinzia Fornai^1,2,4,5,6

¹Department of Evolutionary Anthropology, University of Vienna, Vienna, Austria.

|April 9, 2024

Summary

This summary is machine-generated.

Modern human premolar shape variation shows significant correlation between upper third and fourth premolars (P3s and P4s). Dental crown shape is primarily under genetic control, not geographical origin.

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Area of Science:

Dental Anthropology
Human Evolution
Virtual Anthropology

Background:

Morphological variation in modern human dentition is crucial for understanding human biology and evolution.
Investigating inner crown aspects using virtual anthropology offers new insights.
Dental shape and metrics are relevant to human anatomy and medicine.

Purpose of the Study:

To explore inter- and intra-population morphometric variation of modern humans' upper third and fourth premolars (P3s and P4s).
To analyze both inner and outer crown aspects, and discrete traits using geometric morphometrics.
To assess the influence of geographical origin on dental crown shape and non-metric traits.

Main Methods:

Geometric morphometrics applied to 3D image data of upper P3s and P4s from a geographically balanced sample.
Analysis of dentinal crown shape and crown outline in 78 P3s and 76 P4s from 85 individuals.
Utilized the Arizona State University Dental Anthropology System integrated with recent classifications.

Main Results:

3D shape variation in upper premolar crowns ranged from short/broad to tall/narrow.
Observed shape variation was independent of geographical origin, showing extensive overlap between populations.
A high correlation (r1 = 0.83) was found between upper P3s and P4s; no significant geographic differences in non-metric traits were detected.

Conclusions:

Geographical provenance does not significantly influence modern human dental crown shape.
Dental crown morphology is largely determined by strict genetic control.
The findings contribute to understanding human biological variation and evolutionary pathways.