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Teeth

Teeth

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 and...

Tooth Anatomy

Tooth Anatomy

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 grinding food.

The Evidence for Evolution

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.

Evolution of New Traits in Microbes

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

Evolutionary Psychology

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...

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Related Experiment Video

Updated: May 15, 2026

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture

Published on: November 13, 2013

Tooth patterning and evolution.

Isaac Salazar-Ciudad¹

¹Evolutionary Phenomics Group, Developmental Biology Program, Institute of Biotechnology, University of Helsinki, Helsinki, Finland. Isaac.salazar@helsinki.fi

Current Opinion in Genetics & Development

|December 26, 2012

Summary

This summary is machine-generated.

Teeth offer a unique model for studying development and evolution. Recent research reveals how growth factors and reaction-diffusion systems interact to shape tooth morphology, providing insights into developmental processes.

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Last Updated: May 15, 2026

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture

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Published on: November 13, 2013

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Area of Science:

Developmental Biology
Evolutionary Biology
Mathematical Modeling

Background:

Teeth serve as an excellent model for studying development and evolution due to their independence from systemic influences and ease of preservation.
Morphological variations in teeth are well-documented, providing extensive data for comparative studies.

Purpose of the Study:

To review recent advancements in understanding tooth development as a coupled reaction-diffusion and differential growth system.
To identify key growth factors involved in tooth morphogenesis and their regulatory mechanisms.
To explore discrepancies between tooth development and common reaction-diffusion models to refine developmental system understanding.

Main Methods:

Review of current scientific literature on tooth development and morphogenesis.
Analysis of the interplay between reaction-diffusion systems and growth factor signaling.
Examination of mathematical models simulating tooth development.

Main Results:

Tooth development is characterized by the coupling of reaction-diffusion dynamics with differential growth driven by specific growth factors.
The expression and interaction of these growth factors influence spatial patterns of cell proliferation, dictating final tooth morphology.
Certain aspects of tooth development challenge standard reaction-diffusion model assumptions, offering valuable insights.

Conclusions:

Tooth development can be effectively modeled as a complex interplay between chemical signaling (reaction-diffusion) and cellular growth.
Understanding these mechanisms provides crucial insights into evolutionary processes and developmental biology.
Further refinement of mathematical models is needed to fully capture the nuances of biological developmental systems.