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Salivary Microbiota and Antimicrobial Resistance in Relation to Chlorhexidine Use (SMARCH)

30. april 2026 oppdatert av: Masaryk University

Study Protocol for 16S rRNA Sequencing of Healthy Oral Microbiota

This study evaluated the ecological effects of 0.06% chlorhexidine toothpaste on the salivary microbiota of healthy individuals, focusing on taxonomic composition, functional shifts, and prevalence of predicted antimicrobial resistance genes. Saliva samples were collected from eleven healthy participants at three specific time points: baseline (following a 4-week run-in period using a control toothpaste), intervention (after 12 weeks of using 0.06% chlorhexidine digluconate toothpaste), and washout (after a subsequent 12-week period using the control toothpaste). Sequencing targeted the 16S rRNA V3-V4 region.

Studieoversikt

Status

Fullført

Forhold

Intervensjon / Behandling

Studietype

Intervensjonell

Registrering (Faktiske)

11

Fase

  • Ikke aktuelt

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiesteder

  • Tsjekkia
      • Brno, Tsjekkia, 62500
        • Department of Public Health, Faculty of Medicine, Masaryk University
      • Brno, Tsjekkia, 62500
        • Skydent s.r.o.

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

  • Voksen

Tar imot friske frivillige

Ja

Beskrivelse

Inclusion Criteria:

  • Age: Between 25-44 years.
  • General Health: Good systemic health (absence of chronic inflammatory diseases or conditions affecting oral tissues).
  • Oral Hygiene Routine: Participants must perform toothbrushing twice a day and use interdental cleaning aids once a day.
  • Plaque Index (PI): A score of 0.0-0.2 according to Silness and Löe.
  • Gingival Index (GI): A score of 0.0-0.143 according to Silness and Löe.

Exclusion Criteria:

Systemic and Lifestyle Factors:

  • Presence of any chronic systemic disease (e.g., diabetes mellitus, autoimmune disorders)
  • Regular use of medications that may affect gingival status or saliva production.
  • Use of antibiotics within the last 6 months prior to the study.
  • Current pregnancy or lactation.
  • Current smokers or users of other tobacco/nicotine products.

Oral and Dental Factors:

  • Active dental disease: Presence of untreated tooth decay, gingivitis (GI > 0.143), or any form of periodontitis.
  • Prosthetics and Implants: Presence of dental implants, dentures, or significant tooth loss (excluding extracted third molars).
  • Ongoing fixed or removable orthodontic treatment.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Helsetjenesteforskning
  • Tildeling: N/A
  • Intervensjonsmodell: Enkeltgruppeoppdrag
  • Masking: Ingen (Open Label)

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: Experimental: Chlorhexidine group
A single group of 11 healthy volunteers. The study consists of three consecutive phases: baseline (4 weeks), intervention with 0.06% chlorhexidine toothpaste (12 weeks), and washout (12 weeks).
Legemiddel: 0.06% Chlorhexidine Digluconate Toothpaste
Participants used the toothpaste twice daily for 12 weeks.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Change in Salivary Microbial Alpha Diversity (Shannon and Simpson Indices)
Tidsramme: Baseline (week 0), after intervention (week 12), and after washout (week 24).
Evaluation of microbial richness and evenness within individual saliva samples. Alpha diversity is quantified using the Shannon and Simpson indices based on 16S rRNA gene sequencing data. Differences between study phases (baseline, intervention, washout) are assessed using the Kruskal-Wallis test or Mann-Whitney U test, as appropriate, with a significance threshold of p < 0.05.
Baseline (week 0), after intervention (week 12), and after washout (week 24).
Change in Salivary Microbial Beta Diversity (Community Structure)
Tidsramme: Baseline (week 0), after intervention (week 12), and after washout (week 24).
Evaluation of differences in microbial community composition between study phases. Calculated using Bray-Curtis dissimilarity on Centered Log-Ratio (CLR) normalized data and assessed via PERMANOVA to detect significant shifts (p < 0.05).
Baseline (week 0), after intervention (week 12), and after washout (week 24).

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Differential Abundance of Salivary Bacterial Taxa
Tidsramme: Baseline (week 0), after intervention (week 12), and after washout (week 24).
Evaluation of shifts in the relative abundance of bacterial taxa (at phylum, family, genus, and species levels) using 16S rRNA sequencing (V3-V4 region). Statistical analysis is performed using DESeq2 and edgeR to identify significant differences between study phases, with multiple testing corrections applied using the Benjamini-Hochberg (FDR) method (FDR < 0.05).
Baseline (week 0), after intervention (week 12), and after washout (week 24).
Changes in Predicted Antimicrobial Resistance Genes (ARGs)
Tidsramme: Baseline (week 0), after intervention (week 12), and after washout (week 24).
Functional prediction of the salivary microbiota conducted using PICRUSt2. Assessment of metabolic potential and antimicrobial resistance pathways with significance assessed using adjusted p-values (p-adj < 0.05).
Baseline (week 0), after intervention (week 12), and after washout (week 24).
Gingival Index (GI) for Clinical Stability Assessment
Tidsramme: Screening (Week -4) and after washout (Week 24).
Assessment of gingival health using the Silness and Löe Gingival Index (scale 0-3). This measure is used to verify that participants maintain optimal oral health throughout the study. Eligibility is strictly limited to participants with a maximum GI of 0.143 at screening to ensure a healthy baseline and to monitor that no gingival inflammation occurs during the study period.
Screening (Week -4) and after washout (Week 24).
Plaque Index (PI) for Clinical Stability Assessment
Tidsramme: Screening (Week -4) and after washout (Week 24).
Assessment of dental plaque accumulation using the Silness and Löe Plaque Index (scale 0-3). This measure is used to ensure consistent oral hygiene. Eligibility is strictly limited to participants with a maximum PI of 0.2 at screening. The index is monitored to confirm that participants adhere to the required oral hygiene protocol throughout the study.
Screening (Week -4) and after washout (Week 24).

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Masaryk University

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

11. april 2022

Primær fullføring (Faktiske)

29. november 2022

Studiet fullført (Faktiske)

29. november 2022

Datoer for studieregistrering

Først innsendt

30. april 2026

Først innsendt som oppfylte QC-kriteriene

30. april 2026

Først lagt ut (Faktiske)

6. mai 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

6. mai 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

30. april 2026

Sist bekreftet

1. april 2026

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Andre studie-ID-numre

  • 68/2020
  • MUNI/A/1807/2025 (Annet stipend/finansieringsnummer: Masaryk University)

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

NEI

Legemiddel- og utstyrsinformasjon, studiedokumenter

Studerer et amerikansk FDA-regulert medikamentprodukt

Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

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