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Related Experiment Video

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Microhardness Measurements on Tooth and Alveolar Bone in Rodent Oral Disease Models
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Dentin tubule numerical density variations below the CEJ.

T Komabayashi1, G Nonomura, L G Watanabe

  • 1Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, 707 Parnassus Avenue, D2246, University of California, San Francisco, CA 94143-0758, United States. tkomabayashi@bcd.tamhsc.edu

Journal of Dentistry
|September 13, 2008
PubMed
Summary
This summary is machine-generated.

Dentin tubule density below the cementoenamel junction (CEJ) was uniform at different depths but doubled from the outer to the inner surface. These findings are important for understanding root dentin structure.

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Area of Science:

  • Dentistry
  • Biomaterials Science
  • Microscopy

Background:

  • Dentin tubules are crucial for dentin permeability and mechanical properties.
  • Understanding dentin tubule density variations is essential for restorative and periodontal treatments.
  • The cervical root area presents unique structural characteristics.

Purpose of the Study:

  • To quantify numerical density variations of dentin tubules below the cementoenamel junction (CEJ).
  • To investigate how tubule density differs between superficial and deep dentin layers in the cervical root.
  • To assess tubule density distribution in facial, lingual, mesial, and distal segments.

Main Methods:

  • Human non-carious permanent canines were sectioned into dentin disks 1mm and 2mm below the CEJ.
  • Disks were quartered into facial, lingual, mesial, and distal segments.
  • Scanning electron microscopy (SEM) was used to determine numerical tubule density.
  • Statistical analysis was performed using a three-way ANOVA.

Main Results:

  • Dentin tubule density ranged from 13,700 to 32,300 tubules/mm².
  • Tubule density was uniform at 1mm and 2mm below the CEJ.
  • A significant twofold increase in tubule density was observed from the outer (PDL side) to the inner (pulp side) surface (P<0.0001).

Conclusions:

  • Dentin tubule density variations at the cervical root are not markedly pronounced with depth.
  • A consistent increase in tubule density towards the pulp chamber is a key characteristic of cervical root dentin.
  • These findings contribute to a better understanding of dentin structure in the clinically relevant cervical region.