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Nano-structural and compositional basis of devitalized tooth fragility.

Ksenija Zelic1, Petar Milovanovic1, Zlatko Rakocevic2

  • 1University of Belgrade, School of Medicine, Institute of Anatomy, Laboratory for Anthropology, 4/2 Dr. Subotica, 11000 Belgrade, Serbia.

Dental Materials : Official Publication of the Academy of Dental Materials
|April 16, 2014
PubMed
Summary

Devitalized teeth exhibit increased fragility due to larger mineral crystals and the presence of lower calcium content apatite phases, altering dentin composition and mechanical properties.

Keywords:
Atomic force microscopyDentinEndodonticsEnergy dispersive X-ray analysisMicro-Raman spectroscopy

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Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Mineralized Tissue Biology

Background:

  • Devitalized teeth often show increased fragility, a phenomenon lacking a clear mechanistic explanation.
  • Understanding structural and compositional changes in devitalized dentin is crucial for explaining this fragility.

Purpose of the Study:

  • To investigate the structural and compositional differences between vital and devitalized dentin.
  • To elucidate the mechanisms behind increased tooth fragility after devitalization.

Main Methods:

  • Utilized advanced techniques including Atomic Force Microscopy (AFM), Energy Dispersive X-ray analysis (EDX), and micro-Raman spectroscopy.
  • Analyzed 16 dentin specimens: 8 vital and 8 devitalized (root-canal treated ≥ 2 years prior, no infection).

Main Results:

  • AFM revealed larger mineral crystals and altered mechanical characteristics in devitalized dentin.
  • EDX showed no significant difference in the Ca/P ratio between vital and devitalized dentin.
  • Micro-Raman spectroscopy identified lower calcium apatite phases (octacalcium phosphate, dicalcium phosphate dihydrate, tricalcium phosphate) in devitalized dentin.

Conclusions:

  • Devitalized dentin exhibits larger mineral crystals, potentially reducing mechanical strength.
  • The presence of lower calcium content apatite phases in devitalized dentin contributes to their increased fragility.
  • These findings provide new insights into the basis of devitalized tooth fragility.