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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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Structural modifications of dentinal microcracks with human aging.

Mizuho Kubo1, Jiro Miura, Takao Sakata

  • 1Division for Interdisciplinary Dentistry, Osaka University Dental Hospital, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.

Microscopy (Oxford, England)
|May 15, 2013
PubMed
Summary

Aging affects how microcracks form and spread in dentine. In older teeth, cracks deflect around tubules due to thicker peritubular dentine, unlike younger teeth where cracks follow tubules.

Keywords:
agingcrack propagationdentinal microcracktomography

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Area of Science:

  • Dental research
  • Materials science
  • Biomaterials engineering

Background:

  • Dentinal microcracks are a known phenomenon, with aging influencing their structural modifications.
  • Previous studies primarily used scanning electron microscopy (SEM) for surface analysis of aged dentinal microcracks.
  • Sectional observation of internal dentinal microcracks using transmission electron microscopy (TEM) remains underexplored.

Purpose of the Study:

  • To investigate dentinal microcrack formation mechanisms using TEM.
  • To morphologically assess the relationship between dentinal microcrack propagation and human aging.

Main Methods:

  • Utilized molars from young (16-28 years) and aged (62-76 years) human subjects.
  • Induced microcracks in dentine blocks using an indenter.
  • Sectioned samples with a diamond knife and ultramicrotome after epoxy resin embedding.
  • Observed microcracks via TEM and ultra-high-voltage electron microscope tomography.

Main Results:

  • In young teeth, microcracks predominantly propagated through dentinal tubules.
  • In aged teeth, particularly coronal dentine, microcracks tended to deflect around the outer side of peritubular dentine (PTD).
  • Observed ultrastructural differences in microcrack propagation between young and aged dentine.

Conclusions:

  • TEM enables detailed visualization and evaluation of ultrastructural microcrack propagation within dentine.
  • Age-related differences in microcrack propagation pathways are linked to variations in peritubular dentine thickness.
  • Aging significantly alters dentinal microcrack behavior, impacting structural integrity.