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Related Experiment Videos

Local properties of a functionally graded interphase between cementum and dentin.

Sunita P Ho1, Mehdi Balooch, Sally J Marshall

  • 1Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California San Francisco, 707 Parnassus Avenue, 94143, USA.

Journal of Biomedical Materials Research. Part A
|August 5, 2004
PubMed
Summary

Natural tooth structures, cementum and dentin, exhibit a functionally graded interface. This cementum-dentin junction (CDJ) region shows distinct mechanical and compositional properties, crucial for understanding dental tissue engineering.

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Area of Science:

  • Biomaterials Science
  • Dental Research
  • Tissue Engineering

Background:

  • Natural interfaces in biological systems offer insights for engineering advanced biomaterials.
  • Understanding the cementum-dentin junction (CDJ) is vital for developing functionally graded dental tissues.

Purpose of the Study:

  • To investigate the mechanical, structural, and chemical variations at the interface between cementum and dentin in human molars.
  • To characterize the cementum-dentin junction (CDJ) and its surrounding interphase region.

Main Methods:

  • Utilized nanoindentation, microindentation, optical microscopy, and Raman microspectroscopy on human molar root sections.
  • Prepared thin sections and stained for mineralized regions, analyzed inorganic (apatite) and organic (collagen) content.

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Main Results:

  • Identified a 100-200 micrometer wide interphase with a distinct 10-50 micrometer CDJ exhibiting lower mechanical properties.
  • Nanoindentation and microindentation revealed gradual hardness transitions, with nanoindentation showing greater variation.
  • Raman microspectroscopy indicated compositional gradients in organic and inorganic content across the interphase (80-140 micrometers).

Conclusions:

  • A morphologically and biomechanically distinct CDJ exists within a broader cementum-dentin interphase.
  • Cementum, dentin, and their interphase function as a single, functionally graded dental tissue within the tooth root.