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Related Concept Videos

Tooth Anatomy01:21

Tooth Anatomy

1.7K
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
1.7K

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Related Experiment Video

Updated: Nov 29, 2025

Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
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3D microstructural study of selachimorph enameloid evolution.

C Fellah1, T Douillard2, E Maire2

  • 1Université de Lyon, ENS Lyon, Université Lyon 1, CNRS, LGL-TPE, F-69007 Lyon, France.

Journal of Structural Biology
|November 22, 2020
PubMed
Summary
This summary is machine-generated.

Shark teeth enameloid structure was investigated using Focused Ion Beam Nanotomography (FIB-nt). This revealed interconnected crystallite bundles, challenging previous theories on enameloid origins and evolution in basal Gnathostomes.

Keywords:
EnameloidFIB-SEM serial sectioningFIB/SEM tomographyMicrostructure analysesSharkTooth

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Area of Science:

  • Paleontology
  • Developmental Biology
  • Materials Science

Background:

  • Shark teeth enameloid is a highly mineralized tissue.
  • Its formation involves ameloblast and odontoblast cell interactions.
  • Enameloid comprises Single Crystallite Enameloid (SCE) and Bundled Crystallite Enameloid (BCE).

Purpose of the Study:

  • To investigate the relationship between SCE and BCE in shark teeth.
  • To understand the cellular origins and structural organization of enameloid.
  • To explore the evolutionary history of tooth structure in basal Gnathostomes.

Main Methods:

  • Focused Ion Beam Nanotomography (FIB-nt) was employed to generate 3D images.
  • Analysis focused on fossil and recent neoselachian shark teeth.
  • 3D crystallite bundle architecture was assessed.

Main Results:

  • A strong connection was observed between SCE crystallites and Radial Bundle Enameloid (RBE) crystallites within BCE.
  • Frequent branching and horizontal linking of radial bundles in RBE were visualized.
  • Findings challenge the distinct epithelial (SCE) vs. mesenchymal (BCE) origin hypothesis.

Conclusions:

  • FIB-nt is a powerful tool for studying hyper-mineralized tissue evolution in shark teeth.
  • The interconnectedness of enameloid subunits suggests a more integrated formation process.
  • This research enhances understanding of tooth evolution in early jawed vertebrates.