Gum bacteria in people having bariatric surgery with BMI greater than 30
Official title: Non-interventional Study Exploring the Composition of the Periodontal Microbiota of Patients With Body Mass Index Greater Than 30 That Are Candidates for Bariatric Surgery
Run by University Hospital, Toulouse · NCT06781229 · Data updated 2026-11-12
This will see if people with obesity (BMI ≥30) having bariatric surgery have different gum bacteria depending on whether their BMI is 30–35 or above 35.
Quick facts
| Study type | Observational |
|---|---|
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 170 (estimated) |
| Sponsor | University Hospital, Toulouse Academic / other |
| Locations | 1 site (Toulouse) |
| Status | Recruiting |
| Started | February 3, 2025 |
| Main results expected | February 3, 2028 |
| Study ends | February 3, 2028 |
| Registry record updated | May 8, 2026 |
| Trial ID | NCT06781229 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults with BMI ≥30 who are on the waiting list for bariatric surgery and can understand written and spoken French.
✕Probably not a fit
People who recently took antibiotics or probiotics, are pregnant or breastfeeding, have disqualifying infectious diseases or renal insufficiency, or are not scheduled for bariatric surgery are unlikely to receive benefit from participation.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This is a non-interventional, single-centre, cross-sectional comparison of periodontal microbiota in patients listed for bariatric surgery. Participants complete questionnaires about diet, oral hygiene and quality of life, undergo a dental exam with saliva and periodontal plaque sampling, and have standard radiological checks. During surgery small samples of visceral and possibly subcutaneous adipose tissue may be recovered as surgical waste and stored for future use. The study excludes recent antibiotic/probiotic use, pregnancy or breastfeeding, significant infectious diseases, and other conditions that may alter microbiota measurements.
Why it matters
Potential benefit: If successful, the findings could identify microbial differences linked to obesity severity and inform targeted oral care or perioperative management.
How similar studies have gone: Prior studies have linked obesity with alterations in oral microbiota, but direct comparisons of BMI-defined obesity versus morbid obesity in the bariatric surgery population remain relatively limited.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * BMI greater than or equal to 30 * Be on the list of patients scheduled for bariatric surgery, * Be able to receive information about the study and understand the information form in order to take part in the study. This implies mastering the French language, Exclusion Criteria: * Alcohol consumption \>30g/d (men) or 20g/d (women), * Having taken antibiotics, prebiotics or probiotics in the month prior to inclusion (this has an influence on the composition of the patient's microbiota), * During pregnancy or breastfeeding, * For whom oral surgery is planned (surgery for benign or malignant tumours of the maxillary and mandibular bone bases), or with a history of oral surgery in the month prior to inclusion, * At risk of infection (existence of one or more of the following known chronic infectious diseases: HIV, HBV, HCV and mononucleosis) and/or chronic renal insufficiency (creatinine clearance \< 60ml/min), * Patients with a general pathology that contraindicates the performance of diagnostic procedures such as periodontal probing (patients at high risk of infective endocarditis according to the ANSM). * Totally edentulous patients
Where it's running
-
University Hospital of Toulouse
Toulouse, France Recruiting
Study contacts
- Study coordinator: Stephanie BRAYER, Clinical Trial Assistant, master's degree
- Email: Brayer.Stephanie@iuct-oncopole.fr
- Phone: 0561322509
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.