Significance of cysts

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CYSTS… an abnormal pathologic cavity lined by epithelium and enclosed in a connective tissue capsule. Odontogenic cysts originate from epithelium associated with tooth development while non-odontogenic cysts originate from epithelium trapped during the fusion of facial embryonic processes
Significance of cysts…can result from tooth pathology… ie, a Periapical Granuloma may become cystic and help diagnose the tooth problem… cysts can be destructive by expanding bone, weakening bone to the point of jaw fracture, moving teeth within the jaw bone and resorbing tooth structure… cysts if continuous the oral cavity can become infected…cysts can lead to a misdiagnosis (a nasopalatine canal cyst may resemble a Periapical cyst of a maxillary central if superimposed over the apex when radiograph is taken)
Cysts are classified according to location, cause, origin of lining epithelial cells, histologic appearance and whether it is odontogenic or non-odontogenic
Cysts in bone are intra-osseous, while cysts in soft tissue are called extra-osseous
Odontogenic Cysts

  1. Radicular… or Periapical cyst... most common of odontogenic cysts, usually results from a Periapical Granuloma

  2. residual… results after the extraction of an infected tooth

  3. Primordial... debelops in place of a tooth

  4. Dentigerous … forms around the crown of an unerupted or developing tooth… the teeth primarily affected are mandibular wisdom teeth and maxillary cuspids... intra osseous

  5. eruption… found in soft tissue around crown of a soon to erupt tooth

  6. Lateral periodontal... located on the lateral aspect of a tooth root

Non-Odontogenic Cysts

  1. Nasopalatine canal cyst… within the nasopalatine canal... usually seen on periapicals of mx incisors

  2. medial palatine cyst… midline of hard palate

  3. globulomaxillary… situated between max lateral and cuspid it is now thought to be odontogenic rather than fissual or non-odontogenic in origin

  4. median mandibular… located in the md midline … very rare

*MUCOCELE: traumatize lip, saliva filled blister

*RANULA: involves large salivary ducts. Floor of mouth. Duct to gland gets plugged and causes swelling.

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