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29 Cards in this Set
- Front
- Back
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Define cyst
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pathological cavity, lined by epithelium and containing fluid, semifluid or gas, but not pus
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Cysts are composed of which three basic structures
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Central cavity
epithelial lining Outer wall (capsule) |
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Odontogenic cysts can be classified into which 2 categories based on stimulus
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Inflammatory
developmental |
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What ae the three odontogenic epithelium that play a role in cyst development
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Rests of Malassez
Rests of Serres REE |
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What cyst i derived from rests of Malassez?
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Peri-apical cyst (radicular cyst)
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Most common odontogenic cyst?
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Peri-apical cyst
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The inner most cells of a peri-apical cyst undergo what type of necrosis in establishing a lumen?
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Ischemic liquefactive necrosis
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Granulomas stimulation of Rests of Malassez at the openings of large accessory canals result in what type of cyst?
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Later peri-apical cyst
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What is an important histological feature of peri-apical cysts?
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Rushton (hyaline) bodies - laminated crescent shaped structures
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Define Residual Cyst
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A peri-apical cyst that remains at the site of a previously extracted tooth
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List 3 cysts that are derived from REE
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Dentigerous
Eruption Paradental |
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Four important features of Dentigerous cyst:
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surrounds the crown of an impacted tooth
fluid accumulation between REE and enamel surface Crown inside lumen, Roots outside Asymptomatic |
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Another name for eruption cyst
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Erruption haematoma
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Define eruption cyst
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histological features of a dentigerous cyst
surrounds a tooths crown that has erupted through bone but not the soft tissue |
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Where do paradental cysts occur?
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buccal aspect of erupted mandibular molars (bifurcation cyst)
distal surface of partially errupted mandibular third molars |
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List 4 cysts derived from the Dental Lamina (rests of Serres)
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OKC
Lateral Periodontal cyst Gingival cyst of adult Gingival cyst of infants |
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What is the recurrence rate of OKC?
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25-60%
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What is the third most common odontogenic cyst ad percentage
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OKC (3-11%)
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6 Features of OKC
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aggressive
mostly in mandible, posterior body and ramus can cause large bone destruction Males > females basal cell layer of palisaded cells surface of corrugated parakeratin |
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Multiple OKCs are a consistent feature of which syndrome
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Nevoid basal cell carcinoma
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5 Histology features of OKCs
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basal cell layer of palisaded cells
surface of corrugated parakeratin lumen contains cheesy keratinous debris No inflammatory cells Lack of rete pegs |
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Very similar to ‘gingival cyst of adult’ - Represents an intraosseous manifestations of the same lesion, both being derived from rests of dental lamina
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Lateal periodontal cyst
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Gingival cyst of adult occurs in which decades of life
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5-6th decades of life
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Develops in the gingival soft tissue outside of bone (extra-osseous) and is derived from the rests of the dental lamina
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Gingival cyst of adult
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The lumen of a gingival cyst of infant is filled with?
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Keratin
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List 5 developmental non-odontogenic cysts
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Nasopalatine duct cyst
Nasolabial cyst Oral lymphoepithelial cyst Cervical lymphoepithelial cyst thyroglossal tract cyst |
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2 Important histopathology features of Nasopalatine duct cyst
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Cysts developing in superior position near the nose will have ‘respiratory’ type lining
Cysts developing in the inferior position near the oral cavity will have squamous epithelial lining |
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What is another name for the Nasopaltine Duct cyst and what does it develop from?
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Incisive canal cyst
embryonic Nasopaltine Duct |
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What is the ration of females to males affected by Nasiolabial cyst?
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3:1
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