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High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
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Probing Water Mobility in Human Dentine with Neutron Spectroscopy.

A K Lauritsen1, J E M Pereira1, F Juranyi2

  • 11 Niels Bohr Institute, Faculty of Science, University of Copenhagen, Copenhagen, Denmark.

Journal of Dental Research
|March 27, 2018
PubMed
Summary

This study reveals that demineralized dentine exhibits significantly higher proton mobility, acting like a sponge for water. Innate dentine

Keywords:
dentinhydrogeninfrared spectroscopymotionneutronsthermal analysis

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Area of Science:

  • Biomaterials Science
  • Dental Materials Science
  • Biophysics

Background:

  • Human dentine's structural integrity is crucial for dental health.
  • Understanding water and collagen dynamics is key to material degradation.
  • Demineralization significantly alters dentine's microenvironment.

Purpose of the Study:

  • To investigate hydrogen mobility in both innate and demineralized human dentine.
  • To elucidate the role of hydroxyapatite in protecting dentine collagen.
  • To characterize water and collagen interactions within demineralized dentine.

Main Methods:

  • Neutron spectroscopy to probe hydrogen dynamics.
  • Thermal analysis including differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).
  • Fourier transform infrared spectroscopy (FTIR) coupled with thermal analysis.

Main Results:

  • Demineralized dentine shows 80% higher proton mobility compared to innate dentine.
  • Calorimetry data indicates structural changes in collagen after demineralization.
  • Neutron spectroscopy detected increased mobility of loosely bound water and collagen-bound hydrogen in demineralized dentine.

Conclusions:

  • Hydroxyapatite in innate dentine protects collagen structure.
  • Demineralized dentine acts as a 'sponge,' trapping bulk-like water.
  • Increased proton mobility in demineralized dentine is linked to water and collagen dynamics.