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Early plaque colonization on human cementum.

A Carrassi1, G Santarelli, S Abati

  • 1Department of Dentistry and Stomatology, Medical School, University of Milan, Italy.

Journal of Clinical Periodontology
|April 1, 1989
PubMed
Summary
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Early dental plaque formation on human cementum involves a selective process. Bacteria colonize an organic pellicle, primarily forming coccoid shapes within 24 hours.

Area of Science:

  • Oral microbiology
  • Dental research
  • Scanning electron microscopy

Background:

  • Dental plaque formation is a complex process.
  • Understanding early colonization is crucial for oral health.
  • Cementum serves as a substrate for bacterial adhesion.

Purpose of the Study:

  • To investigate the initial stages of dental plaque development on human cementum.
  • To characterize the morphology and microbial composition of early plaque in vivo.
  • To elucidate the role of the organic pellicle in bacterial colonization.

Main Methods:

  • An in vivo human model using anorganic cementum slabs attached to orthodontic brackets.
  • Scanning electron microscopy (SEM) analysis of cementum surfaces at 2, 4, 8, and 24 hours.

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  • Observation of microbial colonization and plaque morphology over time.

    • Main Results:

    • A thin organic pellicle formed on cementum within 2 hours.
    • Coccoid bacteria were observed at 4 and 8 hours.
    • Filamentous bacteria appeared by 24 hours, oriented perpendicularly to the plaque surface.
    • Early colonization is a selective process mediated by the pellicle, predominantly involving cocci.

    Conclusions:

    • The initial bacterial colonization of human cementum is a selective process.
    • An organic pellicle plays a key role in mediating early microbial adhesion.
    • Coccoid bacteria are the primary colonizers of cementum in the early stages of plaque formation.