RARE DISEASERESEARCH ATLAS
Open navigation menu

ORPHA:99798

Oligodontia

low confidenceDisorder

Also known as: Selective tooth agenesis

Publications

15,939

Trials

0

Interventional, condition-specific

Researchers

1,069

Distinct authors in sample

Gene link

LRP6

Definitive

Readiness

4/6

Stages with a signal

Clinical definition (Orphanet)

Oligodontia is a rare developmental dental anomaly in humans characterized by the absence of six or more teeth.

How rare: How common this is has not been clearly measured.

Orphanet entry

Cross-references

Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.

Additional Mondo synonyms (3)

hypodontia · selective tooth agenesis · tooth agenesis, selective

Research stages

Trial readiness signals

Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”

4/6 stages with a signal

No matched interventional trial, but a gene association and an animal model are on record — often described as translation-ready / stalled at the clinical step.

  1. Gene identifiedPresent

    Definitive — LRP6

  2. LiteraturePresent

    15,939 matched papers (9,784 in last 10 years) Source

  3. Phenotype characterisedPresent

    74 HPO annotations (e.g. Tooth agenesis; Anodontia; Oligodontia) Source

  4. Animal modelPresent

    10 genotype models (Mus musculus) Source

  5. Orphan designationNot found

    No FDA or EMA orphan-drug designation matched this disease via UMLS or preferred name Source

  6. Interventional trialNot found

    No matched interventional trial under our ClinicalTrials.gov rules

Biology

Genes and phenotypes

Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.

Do we know what causes it?

Yes — we know a specific gene responsible (LRP6).

GenCC classification: Definitive.

Phenotypes (Monarch / HPO)

74

Associated phenotypes · MONDO:0005486

  • Tooth agenesis
  • Anodontia
  • Oligodontia
  • Agenesis of premolar
  • Heat intolerance

Showing 5 of 74 — open Monarch for the full list.

Animal models (Monarch / Alliance)

10

Model associations linked to this Mondo ID

Monarch fetch 2026-07-29

Therapies

Designations, candidates, and chemicals

FDA OOPD and EMA orphan designations, Open Targets clinical candidates, and CTD chemical associations via MyDisease.info. These never change the interventional-trial headline.

Orphan designation (FDA · EMA)

No designation matched this disease via UMLS or preferred name on the FDA OOPD mirror or EMA orphan register. Absence here is not proof that none exists under another wording.

Open Targets candidates

No drugs or clinical candidates returned for this Mondo ID on Open Targets.

CTD chemicals (MyDisease.info)

No CTD chemical associations returned for this Mondo ID.

Literature

Is anyone studying this?

15,939

15,939 papers — among the better-studied rare conditions, though still a fraction of common-disease literature (breast cancer: over 700,000). Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=3967) is 59.

15,939 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 59 (publications denominator n=3967).

9,784 in the last 10 years · low confidence

Phrase hits: 6,230 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,069

Distinct author names in 200 sampled papers — named people below.

Who's working on it?

No interventional trial matched this name; these authors publish on it in the sampled literature — a practical starting point for contact.

  1. 01
    Tokita Y5 papers · 2026

    Department of Maxillofacial Surgery, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan. tokita@inst-hsc.jp.

    Papers in Europe PMC
  2. 02
    Liu Y4 papers · 2025

    Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Central Laboratory, Beijing 100081, China.

    Papers in Europe PMC
  3. 03
    Machida J4 papers · 2026

    Department of Maxillofacial Surgery, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.

    Papers in Europe PMC
  4. 04
    Adachi J3 papers · 2024

    Department of Oral and Maxillofacial Surgery, Toyohashi Municipal Hospital, Toyohashi, Japan.

    Papers in Europe PMC
  5. 05
    Aoki Y3 papers · 2024

    Department of Maxillofacial Surgery, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.

    Papers in Europe PMC
  6. 06
    Chen W3 papers · 2025

    Hospital of Stomatology, Guangxi Medical University, Nanning, 530021, Guangxi, China.

    Papers in Europe PMC
  7. 07
    Intarak N3 papers · 2026

    Center of Excellent in Precision Medicine and Digital Health, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand.

    Papers in Europe PMC
  8. 08
    Kim JW3 papers · 2024

    Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea.

    Papers in Europe PMC
  9. 09
    Kim SH3 papers · 2026

    Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea.

    Papers in Europe PMC
  10. 10
    Kim YJ3 papers · 2024

    Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

0

interventional trials for this specific condition

No interventional trial testing a treatment matched this specific condition name. 3 observational studies did — shown below because natural-history and cohort work can be an important step toward a trial.

Data as of 11 September 2026 · last trial check 11 September 2026

No matched interventional trials. This is true for 77.2% of diseases in the trials denominator (5501 of 7126). Here are the researchers publishing on it.

low confidence · 38.6th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

No interventional trial testing a treatment was found for this specific condition name on ClinicalTrials.gov.

See who's working on it — people publishing on this disease are often the practical next contact when no trial is listed.

Observational and natural-history studies

3 observational studies match this condition. These do not test a treatment and are not counted in the interventional-trial headline, but they are genuine research: natural-history work often defines the endpoints needed for a future rare-disease trial, and families may be able to enroll.

Recruiting or not-yet-recruiting

Open the complete matched search on ClinicalTrials.gov

Other registries (secondary)

Broader net from EU CTIS, ISRCTN, and ICTRP when available — deduped against ClinicalTrials.gov IDs already counted above. Dual-model LLM relevance gates what we keep. These rows are not added to the interventional headline.

raw 7 · after dedupe 7 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 7 · dropped 0 · fetched 2026-07-30

Source notes: ictrp: Error: ICTRP public search unavailable (WHO portal is SPA-only; SOAP needs partnership). Tried: https://apps.who.int/tri

No secondary-registry studies passed dual-model relevance for this condition name (after dedupe).

Uncertain / not reviewed (7)

Where to find support

Condition-specific patient organisations, when Orphanet lists them, are on the disease’s Orphanet page. We also link umbrella groups that support undiagnosed and ultra-rare families.

Orphanet entry for Oligodontia — check Associations / patient organisations on that page.

India — NPRD

Last verified 2026-07-26

This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.

Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.

How we counted this

Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.

("Oligodontia" OR "Selective tooth agenesis" OR "hypodontia" OR "tooth agenesis, selective") OR ("LRP6" OR "LRP6 syndrome" OR "LRP6-related")

Run this search on Europe PMC

ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):

"Oligodontia" OR "Selective tooth agenesis" OR "hypodontia" OR "tooth agenesis, selective"

Study-type breakdown: 0 interventional · 3 observational · 0 expanded access. Only interventional studies enter the trial headline.

Query health: ok — strategies attempted: phrase; with hits: phrase

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is short or not clearly distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus
  • Publication count (15939) is extremely high with unknown/missing prevalence — treat as possible over-matching, not proven research intensity

Ingested 2026-07-27T06:18:21.735Z