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Related Concept Videos

Teeth01:15

Teeth

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The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Tooth Anatomy01:21

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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...
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Updated: Jul 8, 2025

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Tooth pattern, development, and replacement in the yellow catfish, Pelteobagrus fulvidraco.

Rui Huang1,2, Li Tang1,3,4, Ruiqi Li1,2

  • 1Department of Stomatology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.

Journal of Morphology
|December 15, 2023
PubMed
Summary
This summary is machine-generated.

This study details tooth development and replacement in Pelteobagrus fulvidraco, revealing distinct stages and independent tooth units. It highlights the unique resorption patterns and non-permanent dental lamina in teleost fish.

Keywords:
Bagridaetooth developmenttooth replacementvertebrate dentition

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Area of Science:

  • Ichthyology
  • Developmental Biology
  • Comparative Anatomy

Background:

  • Teleost fish tooth studies are crucial for understanding dental evolution and regeneration mechanisms.
  • Pelteobagrus fulvidraco, a teleost species, provides a model for investigating tooth development and replacement patterns.

Purpose of the Study:

  • To characterize the tooth structure, development, and resorption patterns in adult Pelteobagrus fulvidraco.
  • To describe the biological stages of tooth development and replacement in this teleost species.

Main Methods:

  • Gross specimen examination
  • Microcomputed tomography (micro-CT) analysis
  • Histological analysis

Main Results:

  • P. fulvidraco possesses villiform and conical oral and pharyngeal teeth in multiple dense rows.
  • Tooth germs originate from the epithelium, and development occurs in independent epithelial-mesenchymal units.
  • Five distinct tooth forms were identified, reflecting various stages of development, mineralization, resorption, and detachment.
  • Seven biological stages of tooth development and replacement were described, showing a discontinuous and non-permanent dental lamina.

Conclusions:

  • P. fulvidraco exhibits a unique, non-simultaneous tooth replacement strategy.
  • The independent tooth unit development and distinct resorption patterns offer insights into teleost dental biology.
  • This research contributes to the understanding of evolutionary mechanisms in vertebrate tooth development and regeneration.