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Updated: Apr 5, 2026
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Oral Biofilm Formation on Different Materials for Dental Implants
Published on: June 24, 2018
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Dentures are a Reservoir for Respiratory Pathogens
Lindsay E O'Donnell1, Karen Smith2, Craig Williams2
1Infection and Immunity Research Group, Glasgow Dental School, School of Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, UK.
Summary
Denture plaque harbors respiratory pathogens, increasing pneumonia risk in denture wearers. Regular denture cleaning may reduce infection rates in older adults.
Area of Science:
- Oral microbiology
- Respiratory medicine
- Geriatric health
Background:
- Dental plaque is linked to pulmonary infections, especially in the elderly.
- Denture wear is common, yet the systemic health impact of denture plaque is understudied.
Purpose of the Study:
- To quantitatively assess respiratory pathogens on dentures.
- To understand the role of dentures in harboring oral bacteria with systemic implications.
Main Methods:
- 130 patient dentures were sonicated to collect plaque biofilm.
- DNA extraction and quantitative polymerase chain reaction (qPCR) were used to identify pathogens.
- Colony forming equivalents (CFEs) were estimated using standard curves.
Main Results:
- 64.6% of dentures showed colonization by respiratory pathogens.
- Six species identified: S. aureus, S. pneumoniae, P. aeruginosa, H. influenzae B, S. pyogenes, M. catarrhalis.
- P. aeruginosa, S. pneumoniae, and S. aureus were most prevalent.
Conclusions:
- Dentures can serve as reservoirs for respiratory pathogens.
- This increases the risk of aspiration pneumonia, particularly in the elderly.
- Improved denture hygiene is recommended to mitigate respiratory infection risks.
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