15 Eruption Disruption/Abnormalities

DEFINITION/OVERVIEW



  • Delay, disruption, or lack of normal eruption sequence of teeth at anticipated or appropriate times
  • Embedded: soft tissue covering

    • Operculum: tough fibrous gingival covering that may persist over the crown of a tooth, even if eruption movement is completed; it may appear as an unerupted tooth (Fig. 15-1)

  • Impacted: hard tissue covering (bone, caught beneath adjacent tooth, deciduous tooth)
  • Unerupted, submerged: other terms occasionally used


x25AA001rs Figure 15-1 Operculum covering mandibular incisors and canines.


c15f001

c15uf003ETIOLOGY/PATHOPHYSIOLOGY



  • Imbalances of endocrine system: retarded tooth eruption
  • Mechanical barriers: closed diastema, malocclusion
  • Persistence/retention of deciduous teeth
  • Trauma to developing tooth that would impair complete eruption or intrude the tooth
  • Familial/breed tendencies

c15uf004SIGNALMENT/HISTORY



  • Occurring in dogs and cats
  • Monitor eruption sequence during appropriate period of development

    • Deciduous teeth
    • Permanent teeth: 4–6 months

  • Delayed eruption: Tibetan terriers, Portuguese water spaniels, Chinese crested

c15uf005CLINICAL FEATURES



  • Unerupted: absence of erupted crown; if not truly missing, it will be present radiographically under the gingival surface

    • Mandibular first premolars are a common tooth unerupted in boxers and bulldogs (Figs. 15-2 and 15-3)

  • Embedded
  • Submerged
  • Operculum: crown may be nearly erupted to full height but is covered, partially or completely, with thick fibrous operculum

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May 22, 2017 | Posted by in GENERAL | Comments Off on 15 Eruption Disruption/Abnormalities

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