Periodontitis and Inflammation: Study on Biological Samples

Recruiting now

Conditions studied: Periodontitis

In brief

Periodontitis is a major public health problem because it is widespread in the adult population. It leads to the irreversible destruction of the anchoring tissues of the teeth, and represents a modifiable risk factor for systemic inflammatory pathologies. This chronic inflammatory disease, which is associated with oral dysbiosis involving Porphyromonas gingivalis, is triggered by a permissive immune response. It is preceded by a reversible clinical phase, during which there is no bone resorption process: gingivitis. The understanding of the key mechanisms involved in the evolution from gingivitis to periodontitis, which will allow to early identify patient at risk of periodontitis, remain unclear at this time. Neutrophils are the main cells of inflammation present within the periodontal pockets. The excess of certain neutrophils or the alteration of their functions is associated with the triggering of periodontitis, whereas their activity, finely orchestrated, would be a key to periodontal homeostasis. It is likely that some periodontal bacteria, including P. gingivalis, but also products of matrix catabolism could deregulate the physiological functions of neutrophils towards pro-inflammatory and catabolic profiles. Moreover, to date, the differentiation and role of neutrophil subsets in periodontal homeostasis as well as in gingivitis and its evolution into periodontitis remain poorly studied. The investigators hypothesize that various subsets of neutrophils may play different roles during the development of periodontitis (evolution of gingivitis to periodontitis). The primary objective is to characterize neutrophil subtypes associated with periodontal destruction during periodontitis. Secondary objectives are : 1. Identify specific interactions of tissue-activated neutrophils with the matrix microenvironment during periodontitis 2. Identify specific interactions of tissue or oral (salivary) activated neutrophils with the oral microbiota during periodontitis 3. Identify specific oral (salivary) neutrophil subtypes in periodontal health, gingivitis and periodontitis 4. Evaluate the function, including pro-osteoclastogenic function, of oral neutrophils compared to blood neutrophils stimulated by infection

Key facts

Study ID

NCT06012019

Run by

Assistance Publique - Hôpitaux de Paris

People needed

60

Starts

2025-04-30

Expected to finish

2028-05-15

Last updated by the study team

2025-08-24

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Common criteria for all patient groups
• Patient > 18 years old
• Patient affiliated to a national health insurance
• Patient who speaks and understands French well enough to be able to read and understand the study information note.
• Patient who does not object to his participation in the study
• Specific Criteria :
• Control Group = BOP < 10%, PI<20%, PD≤ 3mm
• Gingivitis cases = BOP ≥ 10%, PD≤ 3mm
• Periodontitis cases = BOP ≥ 10%, PD> 3mm

You may not qualify if…

• Patients who have received antibiotic prophylaxis, antibiotic therapy, or anti-inflammatory treatment within 3 months prior to inclusion
• Pregnant or breastfeeding women
• Patients suffering from a disease with defective neutrophil number, activity, activation or function
• Patient deprived of liberty by judicial or administrative decision.

Where it is running

• Charles-Foix Hospital — Ivry-sur-Seine, France (enrolling)

Full record on ClinicalTrials.gov

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