Oral Parasitic Infections and Periodontal Disease Dynamics

Oral parasitic protists, notably Entamoeba gingivalis and Trichomonas tenax, inhabit the subgingival environment alongside bacterial communities and host tissues. Once regarded as harmless commensals, these protozoa are now implicated in the progression from gingival inflammation to chronic periodontitis. They contribute to dysbiosis by interacting with periodontopathogenic bacteria, modulating local immune responses and promoting tissue destruction through production of cytolytic enzymes and competition for nutrients such as iron. Molecular analyses have revealed genetic subtypes of E. gingivalis with distinct associations to gingivitis and periodontitis, while T. tenax strains show diversity linked to disease severity. Prevalence studies across age groups and health statuses demonstrate that oral hygiene, socio-economic factors and systemic conditions influence colonisation rates. Improved diagnostic methods, including PCR-based detection and sequence typing, have enabled more precise mapping of parasite-host interactions and have uncovered novel variants. Understanding protozoan roles within the multispecies biofilm offers new avenues for targeted therapies and preventive strategies, ranging from antiparasitic agents to modulation of microbial networks. This research holds global significance for reducing the burden of periodontal disease and related systemic complications by integrating parasitology into comprehensive oral health management.

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Oral Parasitic Infections and Periodontal Disease Dynamics publication trend

The graph below shows the total number of articles in oral parasitic infections and periodontal disease dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Entamoeba gingivalis: A protozoan residing in the periodontal pocket, now recognised for its potential to exacerbate tissue inflammation and dysbiosis.

Trichomonas tenax: An anaerobic flagellated protist found in gingival crevices, associated with advanced stages of periodontal disease.

Dysbiosis: A disruption of the normal microbial balance within the oral biofilm that favours disease-promoting organisms.

Polymerase chain reaction (PCR): A molecular technique used to detect and characterise low-abundance oral parasites by amplifying specific DNA sequences.

Subgingival biofilm: The complex, multi-species microbial community adherent to root surfaces beneath the gum line, central to periodontal pathology.

References

1. Prevalence, socio-economic, and associated risk factors of oral cavity parasites in children with intellectual disability from Lorestan province, Iran. Frontiers in Cellular and Infection Microbiology (2024).
2. Pilot Study on the Prevalence of Entamoeba gingivalis in Austria—Detection of a New Genetic Variant. Microorganisms (2023).
3. Oral Colonization by Entamoeba gingivalis and Trichomonas tenax: A PCR-Based Study in Health, Gingivitis, and Periodontitis. Frontiers in Cellular and Infection Microbiology (2021).
4. Specific clones of Trichomonas tenax are associated with periodontitis. PLOS ONE (2019).