17 Abnormal Number of Teeth (Increased)

DEFINITION/OVERVIEW



  • Increased number of teeth from normal anticipated dentition
  • Supernumerary: increased tooth number, often from separate tooth buds
  • Twinning: a complete mirror image duplication of a tooth resulting from the cleavage of a single tooth bud
  • Gemination: incomplete splitting of a tooth bud resulting in a connected, partial duplication

c17uf003ETIOLOGY/PATHOPHYSIOLOGY



  • Dogs/cats

    • During tooth development (where the dental lamina forms the tooth bud), stimulation, possibly trauma at times, can cause additional bud formation or duplication of an existing bud (twinning)
    • If extra buds fail to split from the initial structure, a gemination tooth may result (see Chapter 18)

c17uf004SIGNALMENT/HISTORY



  • Can occur in any breed, size, or gender
  • Breed prevalence: boxers, bulldogs
  • Apparent at time of permanent tooth eruption; the presence of supernumerary deciduous teeth requires radiographs since additional supernumerary permanent teeth may have delayed eruption

c17uf005CLINICAL FEATURES



  • Increased number of teeth, frequently involving crowding and/or rotation, or displacement of the supernumerary teeth (Fig. 17-1)


x25AA001rs Figure 17-1 Left supernumerary mandibular third incisors with crowding.


c17f001

Dogs



  • Not uncommon

Cats



  • Uncommon for actual supernumerary teeth; gemination of mandibular fourth premolar slightly more common (Fig. 17-2)

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May 22, 2017 | Posted by in GENERAL | Comments Off on 17 Abnormal Number of Teeth (Increased)

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