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Morphological differences between the first and second maxillary premolar crowns: A three-dimensional surface
Julie Miyazaki1, Shintaro Kondo2, Toyohisa Tanijiri3
1Department of Orthodontics, School of Dentistry at Matsudo, Nihon University, Chiba, Japan.
Journal of Oral Biosciences
|January 27, 2024
Summary
Maxillary first premolars (P1) are larger than second premolars (P2), with P1 exhibiting a more developed buccal cusp. These dental morphology differences are explained by developmental models.
Area of Science:
- Anthropology
- Dentistry
- Morphology
Background:
- Understanding tooth morphology is crucial for evolutionary and developmental studies.
- Maxillary premolars exhibit variations that may reflect genetic and environmental influences.
Purpose of the Study:
- To analyze the three-dimensional (3D) structure of maxillary first (P1) and second (P2) premolar crowns.
- To identify morphological differences, especially in cuspal structures, between P1 and P2.
Main Methods:
- Utilized 3D surface homologous modeling on plaster casts from 27 Japanese male students.
- Applied principal component (PC) analysis to 4498 anatomical data points, including 9 landmarks.
Main Results:
- P1 was significantly larger than P2, with similar intercuspal distances.
- PC analysis explained 61.5% of variance up to the fourth PC.
- P1 showed a more developed buccal cusp compared to the lingual cusp, unlike P2.
Conclusions:
- Mesiodistal and buccolingual variations in premolar size and cusp relationships can be elucidated by developmental biology.
- Morphological differences between P1 and P2 are significant and linked to developmental processes.
