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Revelando las estructuras multiscala de Dentin utilizando microscopía electrónica de transmisión de alta resolución

M Leclercq1, M Vallet1,2, T Reiss1

  • 1Université Paris-Saclay, CentraleSupélec, ENS Paris-Saclay, CNRS, LMPS - Laboratoire de Mécanique Paris-Saclay, Gif-sur-Yvette, France.

Journal of dental research
|September 1, 2025
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Resumen
Este resumen es generado por máquina.

Este estudio revela la organización a nanoescala de las fibrillas de colágeno y los cristales de hidroxiapatita en la dentina utilizando TEM de alta resolución. Los hallazgos aclaran la dentina

Palabras clave:
Los colágenos fibrilaresHidroxiapatita y sus derivadosLa nanoestructuraRelación entre estructura y propiedadesComponentes de los dientesTropocolageno y sus derivados

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Área de la Ciencia:

  • Ciencia de los biomateriales
  • Nanotecnología
  • Investigación en odontología

Sus antecedentes:

  • La estructura a microescala de Dentin se entiende bien a través de la microscopía 2D.
  • El análisis microstructural 3D reveló la red porosa de la dentina.
  • La organización a nanoescala de las fibrillas de colágeno (CF) y los cristales minerales en la dentina sigue sin estar clara.

Objetivo del estudio:

  • Para analizar la nanoestructura de la dentina a nanoescala, centrándose en la fibril de colágeno y la organización de cristales minerales.
  • Para investigar la dentina cerca de la unión dentina-esmalte (DEJ) y en la dentina media.
  • Proponer un protocolo para la recogida de muestras TEM para investigar el entrelazamiento mineral/orgánico.

Principales métodos:

  • Microscopía electrónica de transmisión (TEM) de alta resolución
  • Difracción de electrones en el área seleccionada.
  • Orientación de la sección TEM en relación con el eje del tubo.

Principales resultados:

  • Enredamiento tejido revelado de CF y minerales de hidroxiapatita (HAP) con isotropía variable.
  • Los cristales de HAP observados se alargaron a lo largo de los ejes de cristal, formando estructuras en forma de S alrededor de los CF.
  • Identificación de CF paralelas al eje del túbulo en la zona de transición, lo que podría explicar la propagación de grietas.

Conclusiones:

  • El estudio aclara la estructura a nanoescala de la dentina, revelando el entrelazamiento mineral-orgánico.
  • Los hallazgos proporcionan información sobre los gradientes estructurales y la relación estructura-propiedades en la dentina.
  • El protocolo TEM propuesto facilita una mayor investigación de la nanoestructura de la dentina.