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Related Experiment Videos

Bacterial invasion in experimental gingivitis in man.

F R Saglie1, J H Pertuiset, M T Rezende

  • 1School of Dentistry, Center for the Health Sciences, University of California, Los Angeles 90024.

Journal of Periodontology
|December 1, 1987
PubMed
Summary

Bacterial invasion into gingival tissues increases over time during plaque formation. Higher bacterial counts in connective tissue correlate with increased gingival inflammation, suggesting bacteria play a role in early gingivitis.

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Area of Science:

  • Oral microbiology
  • Periodontology
  • Histopathology

Background:

  • Gingival inflammation is a common oral health issue.
  • The role of bacterial invasion in early gingivitis requires further elucidation.

Purpose of the Study:

  • To investigate the incidence and distribution of bacteria within gingival tissues during plaque formation.
  • To correlate bacterial density with gingival inflammation indices.

Main Methods:

  • Gingival biopsies were collected from the mesial papilla of first molars at 0, 14, and 21 days.
  • Biopsies were Gram-stained, sectioned, and examined microscopically for bacterial structures.
  • Gingival and plaque indices were recorded.

Main Results:

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  • Bacterial structures were confirmed in all specimens.
  • Bacteria were most abundant in the outer layers of oral and sulcular epithelium, decreasing with depth.
  • Junctional epithelium showed increased bacterial presence deeper into the tissue.
  • Bacterial counts were significantly higher at Day 21 versus Day 14 in both epithelium and connective tissue.
  • Connective tissue harbored significantly higher bacterial counts than epithelium.
  • Higher bacterial density correlated with elevated gingival and plaque indices.

Conclusions:

  • Bacterial invasion into gingival tissues progresses during plaque formation.
  • Connective tissue exhibits higher bacterial loads than epithelium.
  • Increased intragingival bacterial density is associated with gingival inflammation, suggesting a role in early gingivitis.