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Open research questions in Oral microbiology and periodontitis research

835 unresolved questions extracted from the limitations and future-work sections of 6,489 Oral microbiology and periodontitis research papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Direct causal evidence in humans remains limited - Thorough mechanistic studies will be needed to explore the mechanistic links between periodontal and peri-implant diseases, neuroinflammation, and brain injury

    Editorial: From the mouth to the brain: exploring the link between periodontitis/peri-implantitis and neuroinflammation · 2026 · DOI

  • Further interdisciplinary research is needed to establish the oral-CNS axis as a mature and rapidly evolving field - Research should focus on the bidirectional relationship between the oral cavity and the brain

    Editorial: From the mouth to the brain: exploring the link between periodontitis/peri-implantitis and neuroinflammation · 2026 · DOI

  • small sample of wistar mice (n = 20), - limited to a specific type of periodontitis treatment, - no long-term effects studied

    Antimicrobial and Anti-inflammatory Potential of Thermoresponsive In situ Gel Loaded with Metronidazole Microsponges for Localized Treatment of Periodontitis · 2026 · DOI

  • studying long-term effects of MTZ-MSPs, - investigating other types of periodontitis treatments using MTZ-MSPs, - optimizing the formulation for better release profiles

    Antimicrobial and Anti-inflammatory Potential of Thermoresponsive In situ Gel Loaded with Metronidazole Microsponges for Localized Treatment of Periodontitis · 2026 · DOI

  • The study was limited to 45 participants, - The study was conducted over a four-week period, - Participants were excluded if they had certain medical conditions or were using certain medications

    Oral health effects of nicotine pouches in snus users: clinical and immunological findings · 2026 · DOI

  • The need for effective intracanal medications that can reduce microbial load in infected root canal systems. The limitations of currently available intracanal medications, such as calcium hydroxide, in eliminating microbial biofilms.

    A preliminary antimicrobial investigation of lactobacillus bulgaricus probiotic supernatants as an intracanal medication against mature E. faecalis biofilm in an ex-vivo dentin blocks model · 2026 · DOI

  • Future studies should focus on Lacto- bacillus bulgaricus, following a more comprehensive experi- mental design that incorporates multi-species biofilm models, intact root canal systems, and longitudinal clinical validation. Nonetheless, suf- ficient evidence has not yet been established in the literature to support the clinical use of Lactobacillus bulgaricus in daily endodontic practice.

    A preliminary antimicrobial investigation of lactobacillus bulgaricus probiotic supernatants as an intracanal medication against mature E. faecalis biofilm in an ex-vivo dentin blocks model · 2026 · DOI

  • The evidence was predominantly observational - Substantial between-study heterogeneity was observed across analyses - The certainty of evidence was downgraded for substantial inconsistency and imprecision - Limited number of studies and relatively wide confidence interval for FMD

    Association between periodontitis and subclinical vascular dysfunction: a systematic review and meta-analysis · 2026 · DOI

  • Longitudinal studies to investigate the relationship between periodontitis and subclinical vascular disease - Interventional studies to evaluate the effect of periodontal treatment on endothelial function - Studies to investigate the mechanisms underlying the association between periodontitis and cardiovascular disease

    Association between periodontitis and subclinical vascular dysfunction: a systematic review and meta-analysis · 2026 · DOI

  • The implications of e-cigarette use and dual use on oral health remain uncertain. Distinguishing the effects of vaping from the lingering consequences of prior smoking is a persistent challenge in the literature.

    Heterogeneous Oral Health Outcomes by Combustible Cigarette Smoking, E ‐Cigarette Use and Dual Use: A Cross‐Sectional Population‐Based Analysis · 2026 · DOI

  • Investigate the relationship between oral microbiota and depressive symptoms in a larger sample size. Examine the actual gene abundance, gene expression levels, or host signaling pathway activity as measured by metagenomic analysis. Compare the oral microbiota between patients with epilepsy and healthy individuals.

    A study on oral microbiome characteristics and differences in epilepsy adults with depressive symptoms based on 16S rRNA sequencing · 2026 · DOI

  • The review identifies the challenge of substantial overlap among included reviews, which may exaggerate the apparent strength or consistency of the evidence. The review highlights the challenge of interpreting the findings due to the limited number of eligible reviews and the relatively narrow available evidence base. The review notes the challenge of evaluating the effectiveness of different antibiotic regimens due to differences in patient characteristics, treatment protocols, and methodological quality.

    Systemic Antibiotics as Adjuncts in Periodontal Therapy for Stage III and Stage IV Periodontitis: An Umbrella Review Aligned with the 2018 World Workshop Classification, with AMSTAR-2 Critical Appraisal · 2026 · DOI

  • the limited number of eligible reviews, - considerable overlap among the included reviews, - repeated inclusion of the same trials may give undue weight to certain findings, - small number of trials for azithromycin

    Systemic Antibiotics as Adjuncts in Periodontal Therapy for Stage III and Stage IV Periodontitis: An Umbrella Review Aligned with the 2018 World Workshop Classification, with AMSTAR-2 Critical Appraisal · 2026 · DOI

  • Investigate the relationship between miR-21 polymorphisms and dental caries in other populations, - Examine the mechanisms underlying the association between miR-21 rs1292037 polymorphism and dental caries

    Association between miR-21 polymorphism and the risk of primary dental caries in preschool children · 2026 · DOI

  • The study aims to address the gap in understanding the relationship between miR-21 polymorphisms and primary tooth caries risk in Chinese Han preschool children. Prior work has implicated genetic factors as potential contributors to individual susceptibility to dental caries, but the specific role of miR-21 polymorphisms is not well understood.

    Association between miR-21 polymorphism and the risk of primary dental caries in preschool children · 2026 · DOI

  • The challenge of promoting microbial adhesion and biofilm formation on clear aligners due to their retentive surfaces. The difficulty of removing biofilms from orthodontic appliances due to their resistance to antimicrobial agents. The need to balance the effectiveness of cleaning agents with the potential for surface damage to the aligners.

    Effects of clear aligner cleaning agents on Streptococcus mutans biofilms and thermoplastic surface integrity: an in vitro study · 2026 · DOI

  • The study was conducted in vitro, - The study used a limited number of discs per group, - The study did not assess the long-term effects of cleaning agents on clear aligner surface integrity

    Effects of clear aligner cleaning agents on Streptococcus mutans biofilms and thermoplastic surface integrity: an in vitro study · 2026 · DOI

  • The extensive utilization of antibiotics and other antimicrobial therapies has contributed to the escalating prevalence of antimicrobial resistance. The lack of standardization in study designs and outcomes. The need for further rigorous clinical trials to validate the findings.

    Therapeutic potential of Vaccinium species in the prevention and management of erosion and dental caries: a systematic review · 2026 · DOI

  • Further rigorous clinical trials are required to validate the findings, - The search for safe, effective, and sustainable alternatives to conventional antimicrobial therapies should be intensified

    Therapeutic potential of Vaccinium species in the prevention and management of erosion and dental caries: a systematic review · 2026 · DOI

  • The evidence base is dominated by observational designs, small molecule-specific groups, variable periodontal definitions, incomplete exposure reporting, and limited control of confounding. The review identifies a gap in the literature regarding the pharmaceutical-context reporting of periodontal outcomes. The review highlights the need for prospective investigation to address the pharmaceutical–periodontal reporting gap.

    Monoclonal Antibody Therapies in Chronic Inflammatory Diseases: Periodontal Outcomes, Oral Safety, and Clinical Implications—A Scoping Review · 2026 · DOI

  • The relative contributions of host genetics and environmental exposures to the salivary microbiota from early life to adulthood are unclear. Prior work has reported limited heritability and strong shared environmental effects early in life, but the gap in understanding the relative contributions of these factors from early life to adulthood needs to be addressed.

    Life stage shifts in salivary microbiota determinants: a cross-sectional study in twins · 2026 · DOI

  • The study used a limited number of rats (thirty) - The study used a specific protocol for inducing experimental periodontitis - The study used a specific cell line (RAW264.7 macrophage models) for mechanistic verification

    Isobavachalcone attenuates experimental periodontitis by suppressing PTGS2-associated macrophage ferroptosis and restoring periodontal immune homeostasis · 2026 · DOI

  • The molecular mechanisms by which IBC modulates the macrophage-mediated immune response and cellular survival within the chronic inflammatory microenvironment of periodontitis remain poorly understood. There is a need to investigate the therapeutic efficacy of IBC on periodontitis and elucidate its potential molecular targets.

    Isobavachalcone attenuates experimental periodontitis by suppressing PTGS2-associated macrophage ferroptosis and restoring periodontal immune homeostasis · 2026 · DOI

  • Current treatment options for denture stomatitis have limitations, including tooth staining and oral dysbiosis. There is a need for a new and effective treatment that can inhibit biofilm formation and reduce microbial load. The use of nanoparticles as a delivery system for antimicrobial agents is a promising approach that has not been fully explored.

    Chlorhexidine-miconazole-loaded iron oxide nanoparticles inhibit denture stomatitis biofilms in vitro · 2026 · DOI

  • The study used a murine model, which may not fully represent human peri-implant diseases. The study had a limited sample size. The study focused on the effects of P. gingivalis-LPS on neutrophil activation and recruitment, and did not investigate other potential mechanisms underlying peri-implant inflammation.

    Porphyromonas gingivalis lipopolysaccharide promotes peri-implant inflammation through neutrophil activation · 2026 · DOI

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835 open questions have been extracted from the limitations and future-work passages of 6,489 Oral microbiology and periodontitis research papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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