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Microstructure of primary tooth dentin.

D A Sumikawa1, G W Marshall, L Gee

  • 1Division of Biomaterials and Bioengineering, University of California, San Francisco, USA.

Pediatric Dentistry
|January 14, 2000
PubMed
Summary
This summary is machine-generated.

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Primary teeth dentin shows significant microstructure variations by location and depth, impacting bonding and tooth health. Microcanal occurrence is common, affecting dentin bonding area and potentially tooth sensitivity.

Area of Science:

  • Pediatric Dentistry
  • Dental Biomaterials
  • Tooth Microstructure

Background:

  • Primary dentin microstructure is crucial for understanding tooth development and clinical outcomes.
  • Variations in dentin structure can influence bonding efficacy and clinical performance of dental materials.
  • Previous research has indicated potential differences between primary and permanent dentin, but detailed microstructural analysis is needed.

Purpose of the Study:

  • To investigate variations in primary anterior tooth dentin microstructure.
  • To analyze dentin microstructure at specific areas and depths relative to the dentin-enamel junction (DEJ).
  • To compare dentin microstructure characteristics, including tubule density, diameter, and peritubular width.

Main Methods:

  • Ten primary maxillary anterior teeth were sectioned into matchsticks from the DEJ to the pulp chamber.

Related Experiment Videos

  • Slices were prepared at defined distances from the DEJ (0.15, 0.8, 1.45 mm).
  • Scanning electron microscopy (SEM) was used to determine tubule density, diameter, and peritubular width, with statistical analysis via ANOVA and regression.

    • Main Results:

    • Tubule density decreased with increasing distance from the DEJ.
    • Tubule diameters increased with distance from the DEJ, accompanied by decreased peritubular width.
    • Microcanals (giant dentin tubules) were observed in 4 of 20 teeth examined.

    Conclusions:

    • Primary dentin exhibits significant microstructural differences compared to permanent dentin and varies by location.
    • The reduced area of solid dentin due to these variations may explain differences in bond strength.
    • Microstructural characteristics and microcanal occurrence are important factors for tooth sensitivity, trauma susceptibility, and caries progression.