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Mesoscale structural gradients in human tooth enamel.

Robert Free1, Karen DeRocher1, Victoria Cooley1

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208.

Proceedings of the National Academy of Sciences of the United States of America
|December 19, 2022
PubMed
Summary

Dental enamel

Keywords:
X-ray microdiffractionbiomineralizationtooth enamel

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Area of Science:

  • Biomineralization
  • Materials Science
  • Biomaterials

Background:

  • Dental enamel's mechanical and chemical properties stem from its complex hierarchical structure.
  • Understanding enamel at multiple scales is crucial for addressing dental caries, developmental pathologies, and minimally invasive dentistry.
  • Mesoscale features (1-10 µm) of enamel, specifically single enamel rods and interrod enamel, have been underexplored due to technical challenges.

Purpose of the Study:

  • To investigate the crystallographic and compositional differences between enamel rod heads and rod tails/interrod enamel.
  • To develop a model predicting ion concentrations based on observed crystallographic variations.
  • To reveal previously uncharacterized complexity at the mesoscale level of human dental enamel.

Main Methods:

  • Utilized synchrotron X-ray diffraction with submicrometer resolution.
  • Analyzed crystallite orientation distribution.
  • Applied unsupervised machine learning and a dilute linear model for ion concentration prediction.

Main Results:

  • Demonstrated significant crystallographic parameter differences between rod head and rod tail/interrod enamel.
  • Showed that these variations suggest corresponding differences in crystallite composition, specifically minority ion concentrations (Mg2+ and CO32-/Na+).
  • Observed interindividual variability in absolute crystallographic values and effect signs, necessitating further research.

Conclusions:

  • Human dental enamel exhibits greater complexity at the rod/interrod level than previously understood.
  • The findings provide insights into the mechanisms of tooth development (amelogenesis) and pathologies.
  • These mesoscale variations are important factors for future modeling of enamel's mechanical and chemical performance.