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Transmission electron microscopic characterization of hypersensitive human radicular dentin
M Yoshiyama1, Y Noiri, K Ozaki
1Department of Operative Dentistry, Tokushima University School of Dentistry, Japan.
Journal of Dental Research
|June 1, 1990
Summary
Naturally desensitized teeth show mineral-filled dentinal tubules, while hypersensitive areas reveal empty tubules. This difference in dentin ultrastructure may explain varying tooth sensitivity levels.
Area of Science:
- Dentistry
- Biomaterials Science
- Microscopy
Background:
- Tooth hypersensitivity is a common clinical issue.
- The ultrastructure of dentinal tubules is crucial for understanding dentin permeability and sensitivity.
- Previous studies have investigated dentin structure, but in vivo analysis of hypersensitive versus desensitized areas using advanced microscopy is limited.
Purpose of the Study:
- To investigate the ultrastructural differences in dentinal tubule lumens between hypersensitive and naturally desensitized root surfaces.
- To correlate these structural findings with the clinical status of tooth sensitivity.
Main Methods:
- Utilized a novel biopsy technique for in vivo sample acquisition from exposed root surfaces.
- Employed Transmission Electron Microscopy (TEM) for high-resolution ultrastructural imaging.
- Applied X-ray Microanalysis (XMA) for elemental composition analysis of the dentinal tubules.
Main Results:
- Naturally desensitized areas exhibited dentinal tubules occluded with mineral crystals.
- Hypersensitive areas displayed empty dentinal tubules.
- Electron-dense structures were observed lining the peritubular dentin within the empty lumens of hypersensitive tubules.
Conclusions:
- Mineral occlusion of dentinal tubules is a key feature of natural desensitization.
- Empty dentinal tubules in hypersensitive areas may contribute to increased stimuli transmission.
- The observed electron-dense structures warrant further investigation regarding their role in dentin sensitivity.