Cysts.txt

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Author:
nehashah88
ID:
89320
Filename:
Cysts.txt
Updated:
2012-03-27 10:38:46
Tags:
cysts
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Description:
radiolucent cysts
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  1. Epithelial cysts can be subdivided into?
    • Odontogenic
    • Non-odontogenic
  2. Odontogenic cysts originate from residues of tooth forming organ. Name 3 kinds:
    • Epi rests of Serres e.g. Keratocyst
    • Epi rests of Malassez e.g. Radicular cyst
    • REE e.g. dentigerous cyst
  3. What are the most common cysts?
    • Radicular 60-70
    • Dentigerous 10-15
    • Keratocyst 5-10
    • Nasopalatine 5-10
  4. Odontogenic cysts can be inflammatory or developmental. Name the inflammatory cyst:
    • Radicular
    • Paradental
  5. Most radicular cyst are apical, what other types are there?
    • Residual
    • Lateral
  6. Where do radicular cyst commonly occur and why?
    • Maxilla
    • Incisors, due to palatal invaginations, silicate restorations, trauma, small teeth
    • Usually occur after pulp death (non vital tooth)
    • Chronic infection may stimulate cell rests of Malassez to proliferate
  7. Clinical fts of radicular cyst?
    • Slowly progressing painless swelling with no symptoms
    • Round and hard
    • Bone becomes thin, eggshell thickness, crackling sensation on pressure
    • Part of wall fully resorbs away, leaving a soft fluctuant swelling.
    • Can get infected
  8. Pathogenesis of radicular cyst?
    • Infection from pulp - proliferation of epi rests of malassez
    • Cyst fluid contains high conc of proteins - exert osmotic pressure
    • Cyst tissues release bone resorbing factors
  9. Histopatho radicular cyst?
    • SSE lining - with time lining becomes thinner
    • Chronic inflammation
    • Cholesterol clefts
  10. Treatment radicular cyst?
    • Displace teeth, displace antrum
    • Enucleate and extract/RCT tooth
  11. Who and where are Dentigerous cysts found?
    • Upto age 40. Young adults
    • Encloses crown of U/E tooth.
    • Attached to CEJ
    • L8, U3, L5
  12. Symptoms Dentigerous cyst?
    • Painless enlargement
    • Missing tooth
    • Tilting teeth
  13. Radiographic fts dentigerous cysts?
    • Round, uniloc
    • Envelop crown, CEJ
    • Lucent
    • Corticated, well defined
    • Resorb adj teeth
    • Displace antrum
  14. Histopathology of dentigerous cysts?
    • SSE lining, continuous with REE
    • Fibrous wall similar to radicular, but less inflammatory changes visible.
    • Fluid = clear yellow. Purulent if infected.
  15. What other lesions may envelop the crown of a tooth?
    • Keratocyst
    • Ameloblastoma
    • Adenomatoid odontogenic cyst (anterior)
  16. Lateral Periodontal cyst are positioned where?
    • Beside a tooth (vital), near crest of ridge.
    • Small (<1cm)
    • can extend into the gingivae
  17. Treatment of lateral periodontal cyst?
    Enucleation. Tooth can be retained if healthy.
  18. Sialo-odontogenic cyst occurs in anterior mandible. Histological findings?
    Small glands in epi lining that are lined by mucous cells and secrete mucin.
  19. Three things that help you differentiate a nasopalatine duct cyst from a large nasopalatine foramen?
    • Over 6mm, cyst more likely
    • Foramina are usually oval or irregular
    • Cyst tends to be more lucent having resorbed bone.
  20. What times of primary bone cysts exist?
    • Aneurysmal bone cyst
    • Solitary bone cyst
  21. What does a solitary bone cyst contain?
    • No epi lining
    • Empty
    • Or pale fluid.
  22. What radiographic fts may help you decide solitary bone cyst?
    • Generally less well defined compared to odontogenic cysts.
    • Cavity arches up between the roots of teeth, usually without expansion

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