{"publication_id":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","content_hash":"sha256:075a216d0ba1d96b24272a856955b5710ab6ca70c393dd9a4642b57e54909fbb","nodes":[{"id":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","type":"publication","title":"Research Synthesis: Oral Microbiome Periodontal Aging — full paper"},{"id":"claim_1","type":"claim","text":"Evidence-honesty note: 13/13 retained sources are coded as null or no extracted directional signal; this corpus is non-supportive for clinical efficacy claims and hypothesis-generating only. Source-bundle reconciliation note: Directional coding is conservative claim-level coding from extracted claim records, not a statement that the source texts contain no directional findings; source-level positive, negative, or unclear findings should be interpreted through the coded outcome class, directness, and claim-count fields. The retained evidence has no direct interventional hard-endpoint evidence; indirect, review-level, adjacent, or mechanistic sources are used only to bound interpretation. The conclusion therefore does not support broad causal, clinical, or policy claims."},{"id":"claim_2","type":"claim","text":"The evidence profile contains no sources classified primarily as direct interventional hard-endpoint evidence, 13 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence, with 37 cross-study disagreements across the evidence base."},{"id":"claim_3","type":"claim","text":"No single positive outcome class dominates the retained corpus; null signals cluster in the contextual adjacent evidence, immune and inflammation, safety and comorbidity outcome classes, and negative signals cluster in no dominant outcome class. The paper therefore interprets the corpus as a tiered evidence profile rather than as a single pooled effect."},{"id":"claim_4","type":"claim","text":"The conclusion is that oral microbiome periodontal aging should be treated as a bounded geroscience hypothesis: the retained clinical and adjacent evidence profile defines the scope for targeted testing, while mixed and null findings limit any unqualified anti-aging claim."},{"id":"claim_5","type":"claim","text":"This manuscript is reported as a Thin-corpus evidence brief. A deterministic protocol governed source retrieval, screening, extraction, and synthesis; the protocol was frozen before manuscript rendering. The full audit trail is in the supplementary `methods_pack.json` and the timestamped submission directory `synthesis-oral_microbiome_periodontal_aging-v06-DAILY-2026-06-05T12-02-09Z`."},{"id":"claim_6","type":"claim","text":"The following fields were extracted from each included source: study design, population / cohort, intervention or exposure, comparator, outcome class, effect direction, effect size, confidence interval or credible interval, p-value, sample size, follow-up duration, risk-of-bias rating. Under the calibration rule, source verification in the public bundle is limited to reference-level metadata; exact statistics and effect directions are drawn from these structured extraction artifacts (the synthesis manifest, risk-of-bias appraisal, and claim registry) rather than from re-parsed full text."},{"id":"claim_7","type":"claim","text":"Per-source risk-of-bias was rated using design-appropriate Cochrane RoB-2 (RCTs), ROBINS-I (non-randomised studies), and AMSTAR-2 (systematic reviews / meta-analyses). Ratings recorded in `risk_of_bias.json`."},{"id":"claim_8","type":"claim","text":"Evidence-tension synthesis: claims grouped by outcome class (contextual adjacent evidence, immune and inflammation, longevity, safety and comorbidity); within-class agreement, disagreement, and directness gaps surfaced explicitly. Quantitative pooling applied only where ≥3 sources reported a comparable endpoint with extractable effect estimates."},{"id":"claim_9","type":"claim","text":"Source retrieval, claim extraction, evidence routing, and prose drafting were assisted by large language models under a deterministic audit-trail protocol. Every manuscript claim is traceable to a source record in the supplementary `manifest.json`. Final eligibility and interpretation decisions are author-verified."},{"id":"claim_10","type":"claim","text":"Outcome-class note:** Contextual Adjacent Evidence denotes background, boundary-condition, or adjacent-outcome sources. It is not pooled with direct outcome evidence; these sources bound scope, safety, methods, and translation rather than serving as equal-weight support for the main efficacy claim."},{"id":"claim_11","type":"claim","text":"| Evidence domain | Corpus slice | Strongest signal | Directness | Main limitation |"},{"id":"claim_12","type":"claim","text":"| Contextual Adjacent Evidence | n=9; claims=236 | no extracted directional signal in 9/9 sources | 9 indirect | limited corpus depth in this outcome class |"},{"id":"claim_13","type":"claim","text":"This evidence brief reports outcome packets as a map of retained evidence rather than as a full journal Results narrative or pooled effect estimate."},{"id":"claim_14","type":"claim","text":"9 included sources were assigned to this outcome class. Directional coding: null=9. Directness coding: indirect=9."},{"id":"claim_15","type":"claim","text":"2 included sources were assigned to this outcome class. Directional coding: null=2. Directness coding: indirect=2."},{"id":"claim_16","type":"claim","text":"1 included source were assigned to this outcome class. Directional coding: null=1. Directness coding: indirect=1."},{"id":"claim_17","type":"claim","text":"1 included source were assigned to this outcome class. Directional coding: null=1. Directness coding: indirect=1."},{"id":"claim_18","type":"claim","text":"Verification note:** Reference-only or no-abstract records are treated as verification-limited context, not as equal-weight support for the main claim."},{"id":"claim_19","type":"claim","text":"The curated corpus is composed entirely of observational cohort designs, with no randomized controlled trials or quasi-experimental studies of oral microbiome interventions and aging-related outcomes represented. While mechanistic and associative signals are plentiful, the absence of interventional evidence means that causal claims about microbiome-directed therapies for periodontitis or age-related oral dysbiosis cannot be drawn from this body of work. Long-term mortality or hard cardiovascular endpoint trials involving the oral microbiome–periodontal disease axis were not identified in the corpus, creating a fundamental gap between microbiome signatures and clinically actionable endpoints. As such, conclusions about the therapeutic potential of modulating the oral microbiome for aging-related periodontitis remain provisional and hypothesis-generating only."},{"id":"claim_20","type":"claim","text":"Several outcome domains within this synthesis rest on single-study evidence, precluding within-corpus replication or triangulation. For example, the association between oral microbiome composition and cognitive performance is supported solely by Adnan 2025, while the link between periodontal dysbiosis and non-alcoholic fatty liver disease rests exclusively on Kuraji 2024, an animal-model study using a nisin lantibiotic intervention in mice. Similarly, the koala-specific microbiome–periodontal disease data from Pettett 2025 represents a unique taxonomic context that cannot be cross-validated against any other source in the corpus. These single-trial touchpoints mean that effect sizes and directionality for these associations remain unconfirmed and may not generalize beyond their original study populations."},{"id":"claim_21","type":"claim","text":"The endpoint scope of the corpus is predominantly compositional and inflammatory rather than functional or clinically hard. Most studies reported microbial diversity metrics, taxonomic shifts, and salivary or serum cytokine levels (Gottschalk 2026, Plachokova 2021, Ishihara 2025), but none captured tooth loss, edentulism incidence, or validated periodontal treatment success rates as primary aging-relevant endpoints. Furthermore, the mechanism-to-clinic gap is pronounced: Viana 2025 provides a mechanistic narrative linking neutrophil lifespan and oral microbiome dysbiosis, yet no source in the corpus bridges this mechanistic pathway to a measured clinical outcome in older adults, leaving the translational logic from immune cell biology to periodontal aging outcomes empirically unsupported."},{"id":"claim_22","type":"claim","text":"For oral microbiome periodontal aging, the final interpretation is deliberately tiered: the retained clinical and adjacent evidence profile defines a bounded geroscience rationale, but the corpus does not support treating mechanistic target engagement, intermediate biomarkers, and patient-relevant outcomes as interchangeable evidence. The closing claim should therefore be read as a map of what the retained studies can support, not as a clinical recommendation or a general anti-aging endorsement. Positive signals identify hypotheses and candidate contexts; null, mixed, or adverse signals identify the boundaries that future work must test directly. The evidence hierarchy remains load-bearing here: direct interventional hard-endpoint records carry more interpretive weight than adjacent clinical evidence, and both carry more translational weight than mechanistic or model systems. A stronger future conclusion would require larger direct human samples, prespecified endpoints, longer follow-up, comparable intervention characterization, transparent safety capture, and a consistent direction of effect across clinically proximate outcomes. Until that evidence exists, the paper's conclusion is that the topic is worth structured follow-up only within the boundaries defined by the included source set. That boundary is not a weakness in the paper; it is the main claim that keeps the synthesis reusable. Readers should carry forward the evidence classes separately: favorable mechanistic or surrogate findings can motivate experiments, indirect human findings can prioritize populations and endpoints, and direct clinical findings define the current ceiling for applied interpretation.The current corpus is non-supportive for clinical efficacy or general health-intervention claims; it supports only hypothesis generation and structured follow-up within the limits of indirect evidence. Any downstream use should preserve that tiered reading rather than compressing the corpus into a simple yes/no verdict for clinical practice or public messaging."},{"id":"claim_23","type":"claim","text":"This synthesis maps 13 included sources on Oral microbiome across 4 outcome classes and 37 cross-study disagreements. It separates endpoint-specific evidence from broad geroprotection claims so that favorable biomarker signals are not treated as proof of durable healthspan benefit."},{"id":"claim_24","type":"claim","text":"Across 13 curated reference papers, the evidence base for Oral microbiome shows a context-dependent profile. Null findings dominate: contextual other, immune inflammation. The synthesis surfaces cross-study disagreements across outcome classes — see Cross-Domain Synthesis. The Oral microbiome anti-aging case as currently constituted is incomplete: mechanistic plausibility coexists with mixed or sparse human-RCT evidence, and the boundary conditions remain to be established."},{"id":"claim_25","type":"claim","text":"The strongest unresolved contrast is the agreement between Yama 2023 and Kuraji 2024 on contextual adjacent evidence (severity 1/5), which defines the boundary condition future studies must test rather than smooth over."},{"id":"claim_26","type":"claim","text":"This synthesis adds a design-level evidence-weighting layer and an explicit cross-study disagreement map, keeping boundary conditions visible instead of averaging them away in narrative summary."},{"id":"claim_27","type":"claim","text":"| Evidence domain | Direct sources | Indirect / mechanism sources | Direction profile | Interpretation boundary |"},{"id":"claim_28","type":"claim","text":"| contextual adjacent evidence | 0 | 9 | null | direct interventional hard-endpoint gap |"},{"id":"claim_29","type":"claim","text":"| immune and inflammation | 0 | 2 | null | direct interventional hard-endpoint gap |"},{"id":"claim_30","type":"claim","text":"| safety and comorbidity | 0 | 1 | null | direct interventional hard-endpoint gap |"},{"id":"source_1","type":"source","study":"Potential biomarkers for early periodontal inflammation: investigating CD5 + B cells, salivary cytokines and oral microbiome","year":2026,"doi":"10.1038/s41598-026-37044-6","url":"https://doi.org/10.1038/s41598-026-37044-6","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_2","type":"source","study":"Nisin lantibiotic prevents NAFLD liver steatosis and mitochondrial oxidative stress following periodontal disease by abrogating oral, gut and liver dysbiosis","year":2024,"doi":"10.1038/s41522-024-00476-x","url":"https://doi.org/10.1038/s41522-024-00476-x","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_3","type":"source","study":"Oral Microbiome Signatures in Periodontitis and Edentulism—A Population‐Based Study","year":2025,"doi":"10.1111/jre.70046","url":"https://doi.org/10.1111/jre.70046","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_4","type":"source","study":"The Oral Microbiome across Oral Sites in Cats with Chronic Gingivostomatitis, Periodontal Disease, and Tooth Resorption Compared with Healthy Cats","year":2023,"doi":"10.3390/ani13223544","url":"https://doi.org/10.3390/ani13223544","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_5","type":"source","study":"Non‐Surgical Periodontal Therapy Modulates Oral Microbiome in Primary Immunodeficient Children","year":2025,"doi":"10.1111/jcpe.14201","url":"https://doi.org/10.1111/jcpe.14201","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_6","type":"source","study":"Multi‐Omics Signatures of Periodontitis and Periodontal Therapy on the Oral and Gut Microbiome","year":2025,"doi":"10.1111/jre.70055","url":"https://doi.org/10.1111/jre.70055","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_7","type":"source","study":"Involvement of propionate, citrulline, homoserine, and succinate in oral microbiome metabolite-driven periodontal disease progression","year":2025,"doi":"10.1038/s41598-025-91105-w","url":"https://doi.org/10.1038/s41598-025-91105-w","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_8","type":"source","study":"Oral Microbiome in Relation to Periodontitis Severity and Systemic Inflammation","year":2021,"doi":"10.3390/ijms22115876","url":"https://doi.org/10.3390/ijms22115876","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_9","type":"source","study":"The Oral Microbiome in Queensland Free-Ranging Koalas ( Phascolarctos cinereus ) and Its Association with Age and Periodontal Disease","year":2025,"doi":"10.3390/ani15131834","url":"https://doi.org/10.3390/ani15131834","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_10","type":"source","study":"Dysbiosis of oral microbiome persists after dental treatment-induced remission of periodontal disease and dental caries","year":2023,"doi":"10.1128/msystems.00683-23","url":"https://doi.org/10.1128/msystems.00683-23","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_11","type":"source","study":"Oral microbiome brain axis and cognitive performance in older adults","year":2025,"doi":"10.1038/s44400-025-00004-4","url":"https://doi.org/10.1038/s44400-025-00004-4","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_12","type":"source","study":"Association between Periodontal Disease and Alzheimer's Disease Risk Factors: A Longitudinal Oral Microbiome Study","year":2025,"doi":"10.1002/alz70856_103436","url":"https://doi.org/10.1002/alz70856_103436","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_13","type":"source","study":"Neutrophils at the Crossroads of Oral Microbiome Dysbiosis and Periodontal Disease","year":2025,"doi":"10.3390/microorganisms13112573","url":"https://doi.org/10.3390/microorganisms13112573","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_14","type":"source","study":"**Outcome class** is assigned from the source's bound endpoint, population, and claim text; adjacent/background sources are separated from clinical outcome slices.","year":null,"doi":null,"url":null,"population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"citation"},{"id":"source_15","type":"source","study":"**Directness** is coded as direct only when a source tests the topic against a clinically proximate outcome in the relevant population; a qualifying direct source would be a human interventional or hard-endpoint study of the topic itself. Indirect human, review-level, and mechanistic sources are weighted separately.","year":null,"doi":null,"url":null,"population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"citation"},{"id":"source_16","type":"source","study":"**Directional signal** is counted within the assigned outcome class only. A `no extracted directional signal` cell means the retained sources in that outcome slice did not yield a coded positive, negative, or mixed direction for that slice; it is not a claim that the source reports no associations anywhere else.","year":null,"doi":null,"url":null,"population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"citation"},{"id":"source_17","type":"source","study":"**Evidence tier** follows the deterministic tier/directness taxonomy used in the source builder; the prose writer cannot move a source between classes after sources are frozen.","year":null,"doi":null,"url":null,"population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"citation"}],"edges":[{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_1","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_2","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_3","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_4","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_5","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_6","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_7","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_8","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_9","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_10","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_11","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_12","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_13","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_14","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_15","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_16","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_17","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_18","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_19","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_20","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_21","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_22","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_23","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_24","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_25","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_26","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_27","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_28","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_29","type":"contains_claim"},{"from":"fa3d00ab-72a0-4cb6-aaa0-48b50e0f9875","to":"claim_30","type":"contains_claim"}],"screening":{"identified":13,"screened":13,"excluded":0,"included":13,"included_or_retained":13,"flow":["identified","screened","excluded_with_reasons","included"],"wording":"13 candidate receipts retained after source retrieval, deduplication, and topic filtering. 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