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Related Experiment Video

Updated: May 24, 2025

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Ribbon-like hypomineralization in human dental enamel.

Máté Hegedűs1, Zsolt Kovács1, Lívia Vásárhelyi2

  • 1Department of Materials Physics, Eötvös Loránd University, Budapest, Hungary.

Acta Biomaterialia
|March 3, 2025
PubMed
Summary

A new dental enamel defect, ribbon-like hypomineralization (RLH), is identified. This distinct developmental anomaly differs from molar-incisor hypomineralization (MIH), offering new insights into enamel formation and biochemical controls.

Keywords:
Micro-computed tomographyMolar-incisor hypomineralizationRaman spectroscopyRibbon-like hypomineralizationTransmission electron microscopy

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Area of Science:

  • Biomaterials Science
  • Developmental Biology
  • Nanotechnology

Background:

  • Human dental enamel's mechanical properties rely on precise structure and chemistry.
  • Developmental disorders like molar-incisor hypomineralization (MIH) compromise enamel integrity, leading to reduced function and lifespan.
  • The causes of enamel hypomineralization disorders remain largely unknown.

Purpose of the Study:

  • To report and characterize a novel form of dental hypomineralization: ribbon-like hypomineralization (RLH).
  • To compare the structural and chemical characteristics of RLH-affected enamel with sound and MIH-affected enamel.
  • To elucidate the distinct nanostructural features and potential failure mechanisms of RLH.

Main Methods:

  • Micro-computed tomography (micro-CT) analysis to assess macroscopic features like microporosity, mineral density, and 3D shape.
  • Submicron-scale analysis to reveal nanoporosity and apatite nanocrystal morphology and size.
  • Raman spectroscopy to determine the chemical fingerprint of RLH enamel.

Main Results:

  • RLH enamel exhibits increased microporosity, nanoporosity, and altered apatite nanocrystal morphology and size compared to sound and MIH enamel.
  • RLH shows a unique chemical signature via Raman spectroscopy, distinguishing it from MIH and sound enamel.
  • Unlike MIH, RLH enamel maintains unchanged carbonate levels in affected and unaffected areas.

Conclusions:

  • Ribbon-like hypomineralization (RLH) represents a distinct developmental anomaly of dental enamel.
  • The nanostructural and chemical differences suggest unique failure mechanisms in the biochemical control of RLH crystallization compared to MIH.
  • This study provides novel insights into the diverse biochemical controls governing enamel biomineralization.