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Acute necrotizing ulcerative gingivitis. A transmission electron microscope study.

G J Courtois, C M Cobb, W J Killoy

    Journal of Periodontology
    |November 1, 1983
    PubMed
    Summary
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    Microorganisms like spirochetes invade viable gum tissue in acute necrotizing ulcerative gingivitis (ANUG). This study confirms bacterial penetration into the lamina propria, offering new insights into ANUG lesion development.

    Area of Science:

    • Oral microbiology
    • Periodontology
    • Pathology

    Background:

    • Acute necrotizing ulcerative gingivitis (ANUG) is a severe gum infection.
    • The role of microbial invasion in ANUG pathogenesis requires further elucidation.

    Purpose of the Study:

    • To investigate the invasion of viable gingival connective tissue by microorganisms in ANUG lesions.
    • To provide evidence of spirochete and bacterial penetration into the lamina propria.

    Main Methods:

    • Biopsies from eight ANUG patients were analyzed.
    • Light and transmission electron microscopy were employed for detailed examination.

    Main Results:

    • Spirochetes and other bacteria were confirmed to penetrate the nonnecrotic lamina propria.

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  • Bacterial infiltration depth ranged from 155 to 400 microns.
  • The characteristic four zones of ANUG lesions were identifiable.

    • Conclusions:

    • Microbial invasion of viable connective tissue is a key feature of ANUG.
    • Histological findings may not always correlate with acute clinical presentation.