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Updated: Apr 6, 2026

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture
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Tooth germ invagination from cell-cell interaction: Working hypothesis on mechanical instability.

Hisako Takigawa-Imamura1, Ritsuko Morita2, Takafumi Iwaki3

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake, Sakyo-ku, Kyoto 606-8502, Japan.

Journal of Theoretical Biology
|July 20, 2015
PubMed
Summary

A new theoretical model explains tooth germ development. Mechanical cell interactions cause the dental epithelium to buckle, forming the cap-like shape crucial for tooth structure.

Keywords:
BucklingEpitheliumMorphogenesis

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Area of Science:

  • Developmental Biology
  • Biophysics
  • Computational Biology

Background:

  • Tooth germ development involves a critical bud-to-cap morphological transition.
  • Epithelial-mesenchymal interactions are essential for this transition.
  • The steric design of the tooth is determined during this early developmental stage.

Purpose of the Study:

  • To develop a theoretical model for the autonomous bud-to-cap transition in tooth germ development.
  • To investigate the role of mechanical cell interactions in morphological changes.
  • To explain the formation of the cap-like structure and its invaginations.

Main Methods:

  • A theoretical model incorporating mechanical interactions among cells was developed.
  • Assumptions included peripheral dental epithelial cells forming an elastic sheet and mesenchymal cells restricting growth.
  • Numerical simulations considered time-dependent cell growth to model the morphological transition.

Main Results:

  • The model demonstrated spontaneous buckling of the dental epithelium, mimicking the cap-stage form.
  • Simulations showed that differential growth rates between peripheral and interior epithelial cells influenced invagination.
  • The steric size of the tooth germ was identified as a key factor in determining the number of invaginations.

Conclusions:

  • Mechanical interactions and differential cell growth are sufficient to drive the bud-to-cap transition.
  • The theoretical model provides a novel hypothesis for understanding tooth germ morphogenesis.
  • This approach offers insights into the histological features observed during early tooth development.