Equis ISSN 2398-2977

Teeth: dentigerous cyst

Synonym(s): Heterotopic polyodontia, ear tooth, ear fistula

Contributor(s): Steve Adair, Gordon Baker

Introduction

  • Cysts containing tooth fragments that are situated away from the normal location.
  • Cause: develop from misplaced enamel organs (embryologic origin of teeth from first branchial arch).
  • Signs: depend on location. Discrete swelling with a discharging sinus.
  • Diagnosis: signs, radiography.
  • Treatment: excision of cyst.
  • Prognosis: good.

Pathogenesis

Etiology

  • Congenital.

Pathophysiology

  • First branchial arch (mesenchyme)   →   structures of mandible and maxilla.
  • Ectoderm covering these structures   →   enamel organs that determine the position of teeth.
  • Malpositioning of an enamal organ   →   teeth (or fragments) develop in abnormal sites.
  • Tooth fragments may be attached in a bone alveolus to the zygomatic, temporal, frontal or parietal bone. Occasionally occur within frontal or maxillary sinuses.

Diagnosis

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Treatment

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Smith L C Ret al(2012)Bilateral dentigerous cysts (heterotopic polyodontia) in a yearling Standardbred colt.Equine Vet Educ24(11), 573-578 VetMedResource.
  • Barakzai S Z & Dixon P M (2012)Dentigerous cysts.Equine Vet Educ24(11), 579-581 Wiley Online Library.
  • Gaughan E M (2010)Dentigerous cysts: Congenital anomaly of many years.Equine Vet Educ22(6), 279-280 AAEP.
  • Miller K D & Juzwiak J S (2010)Bilateral degenerative suspensory desmitis with acute rupture in a Standardbred colt.Equine Vet Educ22(6), 267-270 VetMedResource.
  • Gaughan E M & DeBowes R M (1993)Congenital diseases of the equine head.Vet Clin North Am Equine Pract9(1), 93-110 PubMed.
  • Fessler J F (1988)Heterotopic polyodontia in horses- nine cases (1969-1986).JAVMA192(4), 535-538 PubMed.


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