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Related Concept Videos

Teeth01:15

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...

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Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
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Predicting failure in mammalian enamel.

Brian R Lawn1, James Jin-Wu Lee, Paul J Constantino

  • 1Ceramics Division, National Institute of Standards and Technology, Gaithersburg, USA. brian.lawn@nist.gov

Journal of the Mechanical Behavior of Biomedical Materials
|July 25, 2009
PubMed
Summary
This summary is machine-generated.

This study reveals how tooth enamel fractures under biting forces using model domes. Enamel likely deforms along pathways within its structure, offering insights for dental applications.

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Area of Science:

  • Biomaterials Science
  • Mechanical Engineering
  • Dental Research

Background:

  • Tooth enamel's resilience under oral conditions is not fully understood.
  • Fundamental knowledge of enamel's mechanical behavior is limited.
  • Understanding enamel failure mechanisms is crucial for dental health and biomimetic design.

Purpose of the Study:

  • To investigate the mechanical failure modes of tooth enamel under simulated occlusal loading.
  • To explore the role of enamel's microstructure in its fracture behavior.
  • To develop analytical models predicting enamel's response to mechanical stress.

Main Methods:

  • Fabrication of model glass dome specimens simulating enamel/dentine structure.
  • Contact loading tests on glass domes and two-phase materials (glass-ceramics, biomimicked composites).
  • Analysis of deformation and fracture paths, focusing on the rod/sheath structure.

Main Results:

  • Enamel deformation and fracture occur along sliding and fracture paths within the binding phase between mineralized rods.
  • Developed analytical relations for critical loads based on material properties and tooth geometry.
  • Identified key variables influencing enamel's mechanical integrity.

Conclusions:

  • The study provides a novel approach to understanding enamel mechanics using simplified models.
  • Findings suggest fracture initiates within the organic matrix binding the mineralized rods.
  • Results have implications for dental restoration design and understanding evolutionary adaptations in dentition.