🧬 Aging Wiki

gingival-recession

Properties1
aliasesgum recession, receding gums, gingival retraction, gingival withdrawal

21 min read

⚠️ ICD-11 code could not be independently verified (WHO ICD-11 browser requires authentication for API access; JavaScript-rendered interface). ICD-10 K06.0 confirmed standard. A published corrigendum (doi:10.1016/j.freeradbiomed.2026.04.137) exists for the Hao 2026 AIM2 paper — the scope of corrections is not yet determined; the 2.7-fold / 2.4-fold AIM2 figures were confirmed in the original abstract but may have been revised. gap/needs-icd11-code

Gingival Recession

The apical migration of the gingival margin below the cemento-enamel junction (CEJ), exposing the root surface. Clinically expressed as visible root surface, tooth-length elongation (“long teeth”), root hypersensitivity, and elevated risk of root caries. Strongly age-associated: prevalence and extent rise monotonically throughout life and the condition is near-universal in community-dwelling elders 1 2 3. The relationship with age reflects two partially distinct etiologic axes that accelerate cumulatively over the lifespan: inflammatory/periodontitis-driven attachment loss and non-inflammatory/mechanical tissue trauma and biotype-driven attrition.

Classification

The current standard is the Cairo 2011 / 2018 World Workshop classification based on interproximal clinical attachment level (CAL) 4:

TypeDefinitionPrognosis for root coverage
RT1No interproximal CAL lossComplete root coverage achievable
RT2Interproximal CAL loss ≤ buccal recession depthPartial root coverage only
RT3Interproximal CAL loss > buccal recession depthPartial root coverage only; guarded

RT1 corresponds broadly to the older Miller Class I/II (no interproximal bone loss). RT2/RT3 correspond to periodontitis-associated recession. In clinical practice, RT1 and RT2/RT3 map onto the mechanical versus inflammatory etiologic axes respectively, though overlap exists.

Triage note — interproximal involvement is not automatically RT2/RT3. When the clinical picture includes apparent interproximal recession or triangular gaps at the papilla tip (particularly in post-orthodontic anterior teeth), two sharply different conditions must be distinguished before assigning RT2/RT3 and initiating periodontitis treatment:

  1. True interproximal attachment loss — RT2/RT3 — confirms active or prior periodontitis; probing depth and bone-level radiographs show genuine alveolar bone loss at the interproximal crest.
  2. Post-orthodontic open gingival embrasures (“black triangles”) — anatomic papilla deficiency after alignment of previously-crowded anterior teeth; probing depths are normal; bone crest is in a normal position; this is cosmetic papilla loss, NOT attachment loss.

Management diverges sharply: RT2/RT3 requires periodontal treatment (debridement, maintenance, potentially surgical intervention); open embrasures are an anatomic outcome of orthodontic alignment that may respond to interproximal contact recontouring or papilla-regeneration techniques. Misclassifying a black triangle as periodontitis-driven recession leads to inappropriate treatment. See § Special presentation — open gingival embrasures (post-orthodontic papilla loss) below.

Epidemiology and age trajectory

Gingival recession is among the most prevalent oral findings in adults and its prevalence increases with age across every population studied.

Global meta-analysis (Yadav et al. 2023): 15 population-based studies, n=37,460. Pooled prevalence: 78.16% overall; 75.42% for buccal GR specifically; 84.92% at the ≥1 mm threshold; the authors note “more than two-thirds of the population worldwide was affected” and rate evidence quality as “very low” due to heterogeneity in measurement definitions 3.

US NHANES (Romandini et al. 2020): 10,676 US adults representing ~143.8 million people. Patient-level prevalence of any mid-buccal recession: 91.6%. Clinically significant RT1 recession (no interproximal attachment loss): 12.4% (whole mouth); 5.8% in the aesthetic zone only. Risk indicators for RT1 GR were age 35–49, female sex, non-Hispanic White ethnicity, and last dental visit >6 months before examination 1. gap/needs-replication — this analysis used the 2018 classification for re-analysis of existing NHANES data; full RT1/RT2/RT3 stratification by age group not yet published.

European multi-country survey (West et al. 2024): 7 European countries, n=3,551. 87.9% of participants had recession ≥1 mm at one or more sites. Gingival recession and erosive tooth wear continued to increase with age across all age groups, while dentin hypersensitivity declined after approximately age 38–47 2.

Risk factor meta-analysis (Marschner et al. 2025): 22 studies; periodontitis showed the strongest association (OR 9.90, 95%-CI: 4.15–23.60), followed by high frenulum (OR 4.58, 95%-CI: 2.58–8.11), dental plaque (OR 4.26, 95%-CI: 2.91–6.24), occlusal trauma (OR 3.20, 95%-CI: 1.74–5.87), alcohol consumption (OR 2.04, 95%-CI: 1.51–2.75), history of periodontal treatment (OR 1.86, 95%-CI: 1.33–2.58), smoking (OR 1.84, 95%-CI: 1.33–2.53), and male sex (OR 1.52, 95%-CI: 1.36–1.69) 5.

Practical note: Prevalence figures vary substantially depending on threshold: ≥1 mm (81.1%; 95%-CI: 73.9–86.7%) vs ≥3 mm (48.4%; 95%-CI: 39.7–57.2%) vs ≥5 mm (16.2%; 95%-CI: 9.1–27.4%) per Marschner 2025 5. Always specify the threshold when interpreting prevalence data.

Etiologic axis 1 — Inflammatory / periodontitis-associated

Mechanism

Periodontitis is an inflammatory destruction of the tooth-supporting apparatus (alveolar bone, periodontal-ligament, cementum, and gingiva), driven by dysbiosis of the subgingival oral microbiome. Key periodontal pathobionts, particularly porphyromonas-gingivalis, disrupt host innate immunity via gingipain proteases, facilitating polymicrobial dysbiosis and sustained chronic inflammatory infiltrate in the periodontal pocket 6.

The inflammatory cascade degrades the attachment apparatus through:

  1. MMP-driven collagenolysis. Activated MMP-1 (collagenase-1) and MMP-8 (neutrophil collagenase) cleave triple-helical collagen I and III in the periodontal ligament and gingival connective tissue. Pro-inflammatory cytokines (IL-1β, TNF-α, IL-17) from the mixed immune infiltrate drive MMP transcription in both resident fibroblasts and infiltrating neutrophils / macrophages. This is mechanistically parallel to the collagen degradation pathway described in skin-aging, though the immune-driven component is disproportionately greater in gingiva than in skin 6.

  2. Osteoclast-mediated alveolar bone loss. RANKL-RANK signaling dominates, with elevated RANKL from stimulated periodontal fibroblasts and T cells driving osteoclastogenesis. Once alveolar bone dehisces (apical migration of the bony crest), the overlying soft tissue has no support and recedes apically.

  3. Localized periodontitis — molar-incisor / Grade C pattern. A subset of periodontitis presents with interproximal attachment loss concentrated disproportionately at first molars and incisors in younger patients, with disease severity out of proportion to local plaque deposits — the footprint of what was formerly called “localized aggressive periodontitis” and is now classified as localized periodontitis, Grade C under the 2018 World Workshop framework 7. Grade C denotes rapid progression rate (>2 mm bone loss per year at affected sites), strong genetic/familial susceptibility, and impaired neutrophil chemotaxis as a recurrent host-factor theme. In the clinical context of a young adult with no caries, light plaque, and apparent interproximal recession specifically at anterior teeth, this pattern must be actively excluded with full-mouth probing and bitewing/periapical radiographs — good oral hygiene does not rule it out. The disease detail, genetic data, and staging/grading criteria are covered at periodontitis; gingival recession here is the visible consequence of the interproximal alveolar bone loss that characterizes the Grade C pattern. gap/needs-replication — the Grade C molar-incisor prevalence in the broader population (vs referral populations where it was originally characterized) is incompletely characterized.

  4. Gingival fibroblast senescence. Emerging 2026 evidence identifies AIM2 (Absent In Melanoma 2) inflammasome-driven senescence of gingival fibroblasts as a key amplifier: AIM2-overexpressing gingival fibroblasts upregulate SASP components, suppress apoptosis, and drive a “survival-senescence phenotype” that sustains the periodontal inflammatory loop. AIM2 expression in periodontitis tissue is elevated 2.7-fold in epithelium and 2.4-fold in lamina propria vs healthy controls, and correlates positively with attachment loss severity 6. This positions gingival recession partly within the cellular-senescence hallmark.

Aging amplification of the inflammatory axis

The periodontitis-to-recession axis is disproportionately represented in older adults for several reasons:

  • Inflammaging: Age-associated systemic upregulation of IL-6, TNF-α, and IL-1β (see chronic-inflammation) lowers the inflammatory threshold needed for periodontal tissue breakdown. The same systemic milieu that drives sarcopenia and cardiovascular aging potentiates periodontal bone loss.
  • Cumulative dysbiosis: Decades of subgingival biofilm accumulation, compounded by immunosenescence-driven reduced pathogen clearance (see disabled adaptive immunity), means older adults carry higher microbial challenge against a less competent immune response.
  • Impaired wound healing: Gingival fibroblast regenerative capacity declines with age; post-inflammatory tissue repair is slower and less complete, so each inflammatory episode produces a net loss.

Etiologic axis 2 — Non-inflammatory / mechanical

Mechanism

Recession occurring in the absence of significant attachment loss (RT1) is predominantly mechanical in etiology. The primary contributors are:

  1. Toothbrush trauma. Repetitive abrasive force from incorrect brushing technique (horizontal scrubbing, excessive pressure, hard-bristle brush) physically abrades the gingival margin. Over decades, even low-level repeated injury exceeds the reparative capacity of the thin gingival epithelium 8. gap/no-mechanism — the specific contribution of toothbrush trauma to recession extent vs periodontitis-driven recession is incompletely quantified longitudinally.

  2. Thin gingival biotype. Gingival tissue thickness varies constitutively (thin/scalloped vs thick/flat phenotype). Individuals with thin keratinized tissue (<1 mm) have inherently lower resistance to mechanical trauma and less connective tissue reserve for support of the marginal gingiva. The Cairo 2018 classification explicitly incorporates gingival phenotype (thickness + keratinized tissue width) as a prognostic variable.

  3. Alveolar bone dehiscence and fenestration. Thin alveolar bone over the buccal root face can dehisce (complete absence of buccal plate) or fenestrate (window defect in buccal plate) — anatomical variants that substantially increase vulnerability to recession from any mechanical or inflammatory insult. Prevalence of dehiscence in cadaver studies: 20–30% of teeth.

  4. Occlusal forces and parafunction. Excessive occlusal loading (bruxism, parafunctional habits, iatrogenic high-spot restorations) creates lateral strains on the periodontal ligament. Meta-analysis identifies occlusal trauma as an independent risk factor (OR 3.20) 5.

  5. Orthodontic tooth movement. Movement of teeth beyond the alveolar bone envelope (particularly lower incisor proclination) can thin or eliminate the overlying buccal plate, producing iatrogenic recession. This is clinically important because orthodontically-treated patients may present with mechanical recession decades later.

  6. Dental crowding and tooth-size–arch-length discrepancy. Crowded teeth — particularly mandibular incisors and canines in a small arch — often sit labially displaced relative to the alveolar ridge. Root prominences that protrude through or against a thin labial cortical plate create pre-existing dehiscences or fenestrations; the gingiva overlying a bony dehiscence has no supportive bone and is highly susceptible to recession from any mechanical trigger, even gentle brushing. A CBCT study of 32 adults undergoing non-extraction orthodontic crowding correction found that bone dehiscence developed specifically on the facial side of mandibular incisors, and that the degree of crowding (irregularity index) was moderately correlated with facial and lingual marginal bone loss (Pearson r = −0.40 and −0.57 respectively; P≤0.02); incisor proclination per se was not significantly correlated 9. A systematic review of 48 studies found, among the 16 that specifically assessed proclination, that 10/16 reported significantly more recession or increased clinical crown height; across the broader evidence base, thin gingival biotype, pre-existing recession, reduced keratinized gingiva width, and thin facial gingival margin were the strongest baseline predictors of post-orthodontic recession; pre-treatment crowding severity interacted via the biotype pathway 10. In the clinical scenario of a small-arch patient with “large teeth” and anterior crowding, labially-displaced incisors should prompt specific biotype and CBCT assessment of buccal plate thickness before orthodontic treatment — and the presence of buccal recession in that region is likely explained by this mechanism rather than, or in addition to, the brushing technique. gap/needs-replication — CBCT dehiscence data are mostly from surgical and orthodontic case series; large longitudinal cohorts correlating crowding severity directly with recession progression (controlling for biotype and hygiene) are lacking.

Connective tissue thinning as an aging amplifier

The non-inflammatory axis is amplified by fundamental aging changes in connective tissue:

  • Reduced collagen synthesis. Dermal-type gingival fibroblasts show age-related decline in procollagen I and III synthesis, mechanistically parallel to the intrinsic skin aging pathway (see skin-aging and mmp-1). The gingival connective tissue becomes thinner and less resilient with age.
  • AGE accumulation. Advanced glycation end-products (AGEs) accumulate in long-lived collagen fibrils of the periodontal ligament and gingival stroma, making the tissue mechanically stiffer and less extensible. AGE-RAGE signaling also amplifies local MMP production independently of infection, creating a subclinical degradation background. This connects the mechanical axis back to the altered-intercellular-communication hallmark.
  • Epithelial thinning. The gingival epithelium thins progressively after middle age, reducing the physical barrier between the oral environment and the underlying connective tissue.

Special presentation — open gingival embrasures (post-orthodontic papilla loss)

After orthodontic alignment of previously-crowded anterior teeth, the interdental papilla often fails to completely fill the newly-widened embrasure space, producing triangular gaps at the gingival margin — colloquially “black triangles.” This finding is common: 41.9% of orthodontically-treated adults with pre-treatment incisor overlap had post-treatment gingival embrasure spaces in one prospective study 11, and a separate cohort found open gingival embrasures in 43.7% of all treated subjects, rising to 66.7% in patients over age 20 at treatment completion 12. The prevalence increases with adult age because the interproximal contact area elongates coronally with age (wearing and flattening of the contact), increasing the distance between the contact point and the bone crest and reducing the vertical height available for papilla fill.

The Tarnow principle. The single most predictive anatomic variable is the distance from the base of the interproximal contact point to the alveolar bone crest. In a study of 288 interproximal sites across 30 patients, Tarnow, Magner, and Fletcher (1992) showed: when this distance is ≤5 mm, the papilla fills the embrasure nearly 100% of the time; at 6 mm, papilla fill drops to approximately 56%; at ≥7 mm, the papilla is present in 27% or fewer sites 13. When orthodontic alignment increases the interproximal contact length (e.g., by correcting crowding and broadening the contact area coronally), the effective contact-point-to-bone distance may increase beyond 5 mm even without any change in bone level — papilla loss follows anatomically, not because of bone loss.

Distinguishing from true interproximal attachment loss. This distinction is critical and is frequently missed in general practice:

FeatureOpen gingival embrasure (black triangle)True interproximal attachment loss (RT2/RT3 / periodontitis)
Probing depthNormal (≤3 mm)Elevated (≥4–5 mm)
Radiographic bone crestNormal height for siteApical migration of bone crest
Clinical attachment levelNormalLoss of attachment
CausePapilla deficiency, contact elongationPeriodontitis-driven alveolar bone destruction
ManagementInterproximal recontouring, hyaluronic acid injection; papilla-regeneration trialsPeriodontal debridement, maintenance, surgical bone/soft tissue repair

The primary care distinction is therefore: probe interproximal, take a periapical radiograph, and confirm whether the bone crest is normal. If it is, the gap is anatomic papilla deficiency — no periodontitis treatment is indicated. If the bone crest is apically positioned, the gap is genuine attachment loss requiring periodontal intervention.

Mechanism of post-orthodontic papilla loss. The primary cause appears to be resorption of the alveolar crest (increasing the contact-point-to-crest distance) and apical remodeling of the interproximal contact area itself during tooth movement, rather than proclination or extrusion of the incisors per se 12. This alveolar crest remodeling during tooth movement is biomechanically different from periodontitis-driven osteoclastic resorption — the outcome (increased contact-to-bone distance) is the same, but the biology differs.

Age relevance. Open gingival embrasures are disproportionately prevalent in adults treated orthodontically later in life (vs. adolescents) because adult interproximal contacts are already wider/flatter (further from the bone crest) before treatment. This is why the clinical presentation of “recession at the front teeth after braces as an adult” very commonly has a black-triangle component that is anatomic and cosmetic rather than pathological. See the triage note in the Classification section above for the practical distinction from RT2/RT3. gap/needs-replication — longitudinal studies tracking the contact-point-to-bone-crest distance before and after adult orthodontic treatment (using CBCT) are limited.

Downstream consequences

Root caries

Exposed root surface (cementum + dentinal tubules) is substantially more caries-susceptible than enamel:

  • Root surface has no enamel: cementum is thin (~50 µm) and solubilizes at higher pH (critical pH ~6.7 vs ~5.5 for enamel)
  • Dentinal tubules exposed at the CEJ allow rapid bacterial penetration and dentin dissolution
  • Root caries is the leading dental disease of older adults — recession is its principal prerequisite 8

gap/needs-quantitative-recession-rootcaries-risk — the precise relative risk of root caries per mm of recession is not well-characterized in longitudinal studies.

Dentin hypersensitivity

Exposure of dentinal tubules creates a hydrodynamic pathway: thermal (hot/cold), osmotic (sweet/sour), and tactile stimuli displace fluid in the tubules, activating Aδ and C fibers in the dental pulp. Prevalence of dentin hypersensitivity is tightly coupled to recession; the West et al. 2024 study found both conditions to be strongly co-prevalent, with 75.9% of participants showing dentin hypersensitivity signs 2.

Aesthetic and quality-of-life impact

Gingival recession creates visible tooth length asymmetry and “long teeth” appearance that causes patient concern and affects dental aesthetics. This is the primary driver of referral for root coverage procedures. However, aesthetic concern is anatomically concentrated in the anterior maxillary zone; posterior sites are clinically important for caries/hypersensitivity risk but less aesthetically driven.

Hallmark mapping

HallmarkMechanism
chronic-inflammationPeriodontitis-driven MMP activation; inflammaging lowering the tissue-destruction threshold; SASP from senescent fibroblasts
cellular-senescenceAIM2-driven gingival fibroblast senescence amplifying SASP and periodontal destruction; impaired wound repair after each inflammatory episode
loss-of-proteostasisMMP-1/MMP-8-mediated collagen degradation exceeding repair capacity; age-related decline in procollagen synthesis by gingival fibroblasts
altered-intercellular-communicationAGE-RAGE signaling in periodontal ligament collagen; AGE-driven MMP induction independent of infection

Interventions and management

Prevention

  • Correct brushing technique: Soft-bristle brush, circular/Bass technique, avoidance of horizontal scrubbing; powered toothbrush use may reduce lateral abrasive force (full-paper claim — closed-access; gap/no-fulltext-access for this specific sub-finding 2)
  • Periodontal maintenance: Regular supragingival and subgingival debridement to suppress dysbiosis; treating periodontitis halts the inflammatory recession axis
  • Occlusal management: Night-guard for bruxers; correction of iatrogenic high spots

Surgical root coverage

Subepithelial connective tissue graft (SCTG) from the palate remains the gold standard for RT1 (non-interproximal attachment loss) recession — systematic reviews consistently show complete root coverage rates of ~80–90% for RT1 defects. Collagen matrices (xenogenic or allogenic) are increasingly evaluated as donor-site-sparing alternatives. See periodontitis for the surgical treatment evidence base.

Dentin hypersensitivity management

Desensitizing agents (potassium nitrate, stannous fluoride, oxalate compounds), dentin-occluding varnishes, and fluoride application form the conservative management hierarchy before surgical root coverage.

Relationship to systemic aging

Gingival recession exemplifies the principle that oral aging is not compartmentally isolated from systemic aging. The inflammatory hallmarks (inflammaging, cellular senescence, AGE accumulation, connective tissue thinning) that drive cardiovascular aging, sarcopenia, and skin aging converge identically in the periodontal apparatus — the oral tissues are accessible, longitudinally monitorable surfaces where systemic aging processes can be read out. The mouth may serve as a window into systemic biological age; this hypothesis is formalized in several oral-biological-age composite scores, though no validated oral biomarker of systemic aging exists yet. gap/no-mechanism — the causal direction (systemic aging drives periodontal aging vs periodontal disease accelerates systemic aging via inflammatory load) is contested and likely bidirectional.

See also periodontitis, tooth-loss, oral-microbiome-aging-shifts, porphyromonas-gingivalis for the broader oral-aging context.

Limitations and gaps

  • Definition heterogeneity is the dominant barrier to comparing prevalence across studies: ≥1 mm threshold gives near-universal findings; ≥3 mm is clinically more meaningful; ≥5 mm is severe. The field lacks a single universally-adopted operational definition. gap/needs-replication
  • Aging-specific mechanisms undercharacterized. Most mechanistic studies do not age-stratify; the contribution of intrinsic aging hallmarks (AGEs, fibroblast senescence, reduced collagen synthesis) to non-inflammatory recession is inferred by analogy with skin/connective tissue aging rather than directly measured in gingival tissue. gap/no-mechanism
  • ICD-11 code for gingival recession requires manual lookup via WHO ICD-11 browser; left null pending verification. gap/needs-icd11-code
  • Root caries risk quantification. The relative risk of root caries as a function of recession depth/extent is not well-characterized longitudinally. gap/dose-response-unclear
  • Intervention trial age-stratification. Root coverage surgical trials rarely stratify by patient age; whether older adults achieve equivalent complete root coverage rates to younger patients is not systematically addressed. gap/needs-human-replication

Footnotes

Footnotes

  1. doi:10.1111/jcpe.13353 · Romandini M, Soldini MC, Montero E, Sanz M · J Clin Periodontol 2020;47(10):1180-1190 · n=10,676 US adults (NHANES 2009–2014) representing ~143.8 million people · observational · applies 2018 World Workshop classification to NHANES data · patient-level prevalence any mid-buccal recession 91.6%; whole-mouth RT1 prevalence 12.4%; aesthetic-zone RT1 prevalence 5.8%; RT2 88.8%; RT3 55.0%; risk indicators for RT1: age 35–49, female sex, non-Hispanic White ethnicity, dental visit >6 months prior · closed-access ↩ ↩2

  2. doi:10.1016/j.jdent.2024.105364 · West NX, Davies M, Sculean A, Jepsen S, Faria-Almeida R, Harding M, Graziani F, Newcombe RG, Creeth JE, Herrera D · J Dent 2024;150:105364 · n=3,551; mean age 44 ± 17.4; 7 European countries · observational · 87.9% prevalence GR ≥1 mm; DH (Schiff ≥1) 75.9%; GR and ETW increased continuously with age; DH declined after ~age 38–47; BOP plateaued after age 48 · model: human · hybrid-OA; full text not obtained ↩ ↩2 ↩3 ↩4

  3. doi:10.1111/odi.14289 · Yadav VS, Gumber B, Makker K, Gupta V, Tewari N, Khanduja P, Yadav R · Oral Diseases 2023;29(8):2993-3002 · systematic review + meta-analysis · n=15 population-based studies, 37,460 participants · pooled prevalence 78.16% overall; 75.42% buccal GR; 84.92% at ≥1 mm threshold; GRADE evidence quality “very low” due to definition heterogeneity · closed-access ↩ ↩2

  4. doi:10.1111/j.1600-051X.2011.01732.x · Cairo F, Nieri M, Cincinelli S, Mervelt J, Pagliaro U · J Clin Periodontol 2011;38(7):661 · n=25 patients, 116 gingival recessions (109 treated) · ICC=0.86 inter-examiner agreement · reliability + predictive validity study; defines RT1/RT2/RT3 based on interproximal CAL; RT1 = no interproximal attachment loss; classification predictive of final recession reduction (p<0.0001) at 6-month follow-up · open-access (HAL preprint) ↩

  5. doi:10.1016/j.jdent.2025.105645 · Marschner F, Lechte C, Kanzow P, Hraský V, Pfister W · J Dent 2025;155:105645 · systematic review + meta-analysis · 21 sources (22 studies); low risk-of-bias majority · pooled prevalence: 81.1% (95%-CI: 73.9–86.7) ≥1 mm; 48.4% (95%-CI: 39.7–57.2) ≥3 mm; 16.2% (95%-CI: 9.1–27.4) ≥5 mm · risk factors (OR; 95%-CI): periodontitis 9.90 (4.15–23.60); high frenulum 4.58 (2.58–8.11); dental plaque 4.26 (2.91–6.24); occlusal trauma 3.20 (1.74–5.87); alcohol 2.04 (1.51–2.75); periodontal treatment history 1.86 (1.33–2.58); smoking 1.84 (1.33–2.53); male sex 1.52 (1.36–1.69) · hybrid-OA; full text not obtained ↩ ↩2 ↩3

  6. doi:10.1016/j.freeradbiomed.2025.12.048 · Hao C, Chen R, Fan Z, Wang S · Free Radic Biol Med 2026;245:71-83 · in vitro + human tissue multiplex immunofluorescence · AIM2 mean fluorescence intensity elevated 2.7-fold (epithelium) and 2.4-fold (lamina propria) vs healthy controls; AIM2 levels correlated positively with bleeding on probing and attachment loss; AIM2 overexpression in hGFs increased p16^INK4A^ and ROS, reduced apoptosis (survival-senescence phenotype), enhanced SASP; AIM2 knockdown reversed these changes · model: human periodontitis tissue + human gingival fibroblast (hGF) cell culture · ⚠️ A published corrigendum (doi:10.1016/j.freeradbiomed.2026.04.137, PMID 42120252, August 2026) exists for this paper; the scope of corrections has not been determined; the quantitative figures above are from the original abstract and may have been revised · gap/needs-replication — single-group study; mechanistic claims require independent replication · closed-access ↩ ↩2 ↩3

  7. doi:10.1002/jper.17-0721 · Papapanou PN, Sanz M, Buduneli N, et al. (28 authors) · J Periodontol 2018;89(Suppl 1):S173-S182 · consensus report · 2017 World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions, Workgroup 2 · defines unified periodontitis classification replacing separate “chronic” and “aggressive” categories; Grade C = rapid progression rate (>2 mm/year bone loss), strong genetic/familial susceptibility, impaired neutrophil chemotaxis; molar-incisor pattern (formerly localized aggressive periodontitis) classified as localized, Grade C · model: human (consensus/classification document) · open-access (J Periodontol supplemental issue) ↩

  8. doi:10.1111/joor.12474 · Carvalho TS, Lussi A · J Oral Rehabil 2017;44(4):291-298 · review · 155 citations · “gingival recession is the main causal factor of root caries and dentine hypersensitivity”; reviews age-related changes in tooth structure including secondary dentine formation, cementum thinning, pulp chamber reduction; covers histological and functional changes relevant to aging oral biology ↩ ↩2

  9. doi:10.5624/isd.20200260 · Valerio CS, Cardoso CAEA, Araújo EA, Zenóbio EG, Manzi FR · Imaging Sci Dent 2021;51(2):155 · n=32 adults (64 paired CBCT scans pre/post non-extraction orthodontic crowding correction) · observational (CBCT cohort) · bone dehiscence developed specifically on the facial side of mandibular incisors; degree of crowding (irregularity index) was independently associated with risk of developing bone dehiscence; incisor proclination per se was not significantly correlated with bone loss · model: human · open-access (PMC) ↩

  10. doi:10.1093/ejo/cjad026 · Cadenas de Llano-Pérula M, Castro AB, Danneels M, Schelfhout A, Teughels W, Willems G · Eur J Orthod 2023;45(5):528-544 · systematic review · 48 eligible studies total; 16 of those assessed proclination-related recession prevalence · risk factors for gingival recession after orthodontic treatment; 10/16 proclination-focused articles found significantly more recession or increased clinical crown height; pre-treatment thin gingival biotype, previous recession, reduced keratinized gingiva width, and thin facial gingival margin thickness were strongest baseline predictors; symphysis morphology associated in 5/7 studies; skeletal class and Angle classification not associated; meta-analysis not possible due to data heterogeneity · model: human · green open-access (KU Leuven institutional repository) ↩

  11. doi:10.1016/s0889-5406(94)70013-3 · Burke S, Burch JG, Tetz JA · Am J Orthod Dentofacial Orthop 1994;105(5):506-511 · n=129 orthodontically-treated patients with pretreatment maxillary central incisor overlap · observational · 41.9% (54/129) had post-treatment black triangular gingival embrasure space; mean embrasure width 0.43 mm · model: human · closed-access · gap/no-fulltext-access — not verified against primary PDF ↩

  12. PMID:12790352 · Ko-Kimura N, Kimura-Hayashi M, Yamaguchi M, Ikeda T, Meguro D, Kanekawa M, Kasai K · Aust Orthod J 2003;19(1):19-24 · n=80 orthodontic patients (33 male, 47 female; ages 15–31 years) · observational · open gingival embrasures in 43.7% of all subjects; 66.7% in patients over age 20 at end of treatment; crowding severity (groups: <4 mm, 4–8 mm, >8 mm) was not significantly associated with embrasure prevalence; alveolar crest resorption identified as primary causative factor (rather than incisor extrusion or proclination) · model: human · no DOI assigned; PMID 12790352 confirmed via PubMed · closed-access (abstract-level verification only) ↩ ↩2

  13. doi:10.1902/jop.1992.63.12.995 · Tarnow DP, Magner AW, Fletcher P · J Periodontol 1992;63(12):995-996 · n=30 patients, 288 interproximal sites · observational cross-sectional · papilla fill by contact-point-to-bone-crest distance: ≤5 mm → ~100% fill; 6 mm → ~56% fill; ≥7 mm → ≤27% fill · model: human · closed-access · gap/no-fulltext-access — quantitative thresholds widely cited in secondary literature but not verified against primary PDF ↩

Graph View

Backlinks