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Effect of adjuvant probiotic therapy (Lactobacillus reuteri) in the treatment of periodontitis associated with diabetes mellitus: clinical, controlled, and randomized study

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Abstract

Objectives

Subgingival instrumentation (SI) with probiotics may be a proposal for the treatment of periodontitis (P), for patients with type 2 diabetes mellitus (T2DM). The Lactobacillus reuteri probiotic as an adjunctive therapy in the treatment of P associated with T2DM was evaluated.

Materials and methods

Forty diabetic participants diagnosed with P (stage III and IV, grade B) were randomized into SI + Placebo (n = 20): subgingival instrumentation plus placebo lozenges and SI + Probi (n = 20): subgingival instrumentation plus probiotics. Probing depth (PD), gingival recession (GR), clinical attachment level (CAL), plaque index (PI), bleeding on probing (BoP), and PISA index were performed at baseline and 30, 90, and 180 days. Cytokine concentration in the gingival crevicular fluid, subgingival biofilm sample, and LDL and HDL subfractions were evaluated.

Results

In the deep pockets, PD in SI + Probi showed increased values (p = 0.02) compared to SI + Placebo at 90 days. For CAL, SI + Probi showed increased values compared to SI + Placebo, with a significant difference at 30 days (p = 0.03), 90 days (p = 0.02), and 180 days (p = 0.04). At #PD ≥ 7 mm, SI + Probi had a more frequent number of sites (p = 0.03) compared to SI + Placebo only at baseline. For the PISA, SI + Probi showed a significant difference (p = 0.04) compared to SI + Placebo at 90 days. For cytokines, SI + Probi showed higher quantification than SI + Placebo for IL-10 (p < 0.001) at 90 days, IL-12 (p = 0.010) at 90 days, IL-1β (p = 0.035) at 90 days, and IL-8 (p = 0.003) at baseline. SI + Placebo showed higher quantification of IL-1β (p = 0.041) compared to SI + Probi only at 30 days. There was a reduction in all microbial complexes. SI + Probi improved LDL size (246.7 nm vs 260.4 nm; p < 0.001), while large HDL subfractions were reduced aft 180 days of treatment (24.0% vs 20.3%; p = 0.022) when compared with SI + Placebo; this response was dependent of probiotics (1.0 mg/dL vs − 6.2 mg/dL; p = 0.002).

Conclusion

Subgingival instrumentation improved the clinical periodontal parameters in patients with T2DM. The use of L. reuteri probiotics had no additional effects compared with the placebo; however, there was a positive effect on the lipoprotein subfraction.

Clinical relevance

Scientific rationale for study: subgingival instrumentation with probiotics may be a proposal for the treatment of periodontitis (P), especially for patients with type 2 diabetes mellitus (T2DM). Principal findings: the use of L. reuteri probiotics had no additional effects compared with the placebo; however, there was a positive effect on the lipoprotein subfraction. 

Practical implications: L. reuteri as an adjunct to subgingival instrumentation may have significant therapeutic implications in dyslipidemia.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author, [MANJ]. The data are not publicly available due to their containing information that could compromise the privacy of research participants.

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Funding

The work was financed in part by the Coordination for the Improvement of Higher Education Personnel–Brasil (CAPES)–Finance Code 001, National Council for Scientific and Technological Development from Brazil, National Institute of Science and Technology Complex Fluids (INCT-FCx)-(CNPq–465259/2014–6), and São Paulo Research Foundation (FAPESP–2014/50983–3 and 2016/24531–3).

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Contributions

All authors contributed to the study conception and design. Conceptualization: MANJ and JFP; methodology: MANJ, JFP, CLF, CMMN, COR, MNA, AMFN, DL, NRTD; formal analysis and investigation: JFP, CLF, CMMN, COR, MNA, DL, NRTD; writing—original draft preparation: MANJ, CLF, CMMN; writing—review and editing: MANJ, JFP, CLF, CMMN; funding acquisition: AMFN, MANJ, DL, NRTD; resources: for the biological assays: MANJ, AMFN, DL, NRTD; supervision: MANJ. The manuscript was written by MANJ, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Maria Aparecida Neves Jardini.

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The present study followed the rules of the new CONSORT statement and SPIRIT statement. It was approved by the Human Research Ethics Committee of the Dentistry course in São José dos Campos–UNESP, under number 2.708.923 and Register Number RBR-8t4qqx, in the Brazilian Registry of Clinical Trials (ReBEC).

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Jardini, M.A.N., Pedroso, J.F., Ferreira, C.L. et al. Effect of adjuvant probiotic therapy (Lactobacillus reuteri) in the treatment of periodontitis associated with diabetes mellitus: clinical, controlled, and randomized study. Clin Oral Invest 28, 80 (2024). https://doi.org/10.1007/s00784-023-05441-0

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