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The Oral Microbiota01:27

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Inducing Apical Periodontitis in Mice
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Microgravity Exacerbates Periodontitis In Vivo.

Ahmed Bakri1, Asmaa Ismail2, Alaa Mansour1

  • 1Periodontology Unit, College of Dental Medicine, University of Sharjah, UAE.

Journal of Periodontal Research
|May 31, 2025
PubMed
Summary
This summary is machine-generated.

Microgravity worsens periodontitis, causing significant bone loss and immune cell infiltration in this first-ever in vivo study. These findings may inform future treatments for periodontal disease in space and on Earth.

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Area of Science:

  • Oral biology
  • Space medicine
  • Immunology

Background:

  • Periodontitis is a common inflammatory disease affecting tooth-supporting structures.
  • Spaceflight poses unique physiological challenges, including microgravity.
  • The effects of microgravity on periodontal health are largely unknown.

Purpose of the Study:

  • To investigate the impact of simulated microgravity on induced periodontitis in a live animal model.
  • To assess changes in alveolar bone, gingival crevicular fluid (GCF) markers, and periodontal tissue destruction.
  • To identify potential immune responses associated with periodontal disease under microgravity conditions.

Main Methods:

  • Induction of periodontitis in an in vivo model.
  • Exposure to simulated microgravity conditions.
  • Analysis of alveolar bone loss using imaging techniques.
  • Measurement of GCF alkaline phosphatase (ALP) levels.
  • Histopathological examination of periodontal tissues for inflammation and immune cell infiltration.

Main Results:

  • Simulated microgravity significantly exacerbated alveolar bone loss compared to control groups.
  • Elevated levels of GCF alkaline phosphatase were observed in the microgravity group, indicating increased tissue activity and inflammation.
  • Severe periodontal destruction, characterized by significant immune cell infiltration, was evident in animals exposed to microgravity.
  • The study provides the first in vivo evidence of microgravity's detrimental effects on periodontal disease progression.

Conclusions:

  • Simulated microgravity adversely affects periodontal health, leading to increased bone loss and inflammation.
  • GCF alkaline phosphatase may serve as a sensitive biomarker for microgravity-induced periodontal changes.
  • Understanding the molecular mechanisms underlying these changes is crucial for developing countermeasures.
  • Findings have implications for astronaut oral health and potential terrestrial applications for periodontitis treatment.