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Ultrastructural study on human root caries.

R M Frank1, P Steuer, J Hemmerle

  • 1Centre de Recherches, Unité INSERM U 157, Faculté de Chirurgie Dentaire, Strasbourg, France.

Caries Research
|January 1, 1989
PubMed
Summary
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Root caries in older adults involves gram-positive bacteria infiltrating cementum and dentin. This bacterial invasion destroys minerals and collagen, leading to extensive root dentin damage.

Area of Science:

  • Dental Research
  • Microbiology
  • Cariology

Background:

  • Root caries is a significant oral health issue, particularly in aging populations.
  • Understanding the microbial and structural changes in root caries is crucial for effective treatment strategies.

Purpose of the Study:

  • To investigate the ultrastructural characteristics of superficial root caries lesions.
  • To analyze bacterial infiltration patterns and their effect on cementum and dentin.

Main Methods:

  • Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used.
  • Analysis of root caries lesions from 24 patients aged 52-60 years.

Main Results:

  • Predominantly gram-positive bacteria with corncob configurations were observed in root plaque.

Related Experiment Videos

  • Bacterial infiltration into cementum occurred without demineralization, following structural borders.
  • Root dentin invasion showed demineralization gradients, with bacteria filling tubules and destroying intertubular dentin and collagen.

    • Conclusions:

    • Root caries progression involves direct bacterial invasion and matrix destruction in cementum and dentin.
    • Gram-positive bacteria play a key role in the demineralization and degradation of root structures.
    • The findings highlight the aggressive nature of root caries at a microscopic level.