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OBIOL 305 > Odontogenic Tumors > Flashcards

Odontogenic Tumors Flashcards

0
Q

What’s the most common type of odontogenic epithelium tumor of clinical significance?

A

Ameloblastoma

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1
Q

What are the three classifications of odontogenic tumors.

A
  1. Tumors in odontogenic epithelium
  2. Mixed tumors in odontogenic epithelium and mesenchyme
  3. Mesenchymal tumors
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2
Q

What are the variant types of Ameloblastomas?

A
  1. Conventional solid/multicystic - most common, mainly in adults, often associated with third molars, root resorption is common, high recurrence rate
  2. Unicystic - thought to occur as a result of Ameloblastomic transformation of the lining epithelium of a dentigerous cyst, often associated with unerupted third molars, best treated by enucleation
  3. Peripheral - extraosseous, rare
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3
Q

What’s the main difference between conventional and unicystic ameloblastomas?

A

Conventional occur more commonly in older adults and unicystic are seen to occur in teen’s and young adults in their 20’s

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4
Q

Which type of odontogenic tumor would present radiographically with calcified structures varying in shape?

A

Calcifying epithelial odontogenic tumor

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5
Q

Which tumor is most common in patients age 10-19?

A

Adenomatoid odontogenic tumor

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6
Q

“Is considered to be a true mixed tumor in which both the epithelial and mesenchymal components are neoplastic”

A

Ameloblasts fibroma

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7
Q

What is the most common type of mixed odontogenic tumor?

A

Odontoma

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8
Q

What is a hamartoma?

A

A benign focal malformation that resembles a neoplasm in the tissue of origin, it grows at the same rate as the surrounding tissues

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9
Q

What are the subtypes of odontomas?

A
  1. Compound odontoma - multiple little teeth

2. Complex odontoma - large mass of calcified tissue

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10
Q

If a radiograph shows an odontogenic tumor that has a multilocular radiolucency, what are possible differential diagnoses?

A
  1. Odontogenic myxoma
  2. Ameloblastic fibroma
  3. Calcifying epithelial odontogenic tumor
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11
Q

What mistake is often made regarding periapical cemental dysplasia?

A

Endodontic treatment is performed as it is often mistaken for periapical disease (rarefying osteitits) - must do vitality testing to rule out periapical pathology

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12
Q
  • Mesenchymal
  • thought to be a reactive process
  • increased incidence in black patients
  • mimic rarefying osteitis
  • no treatment recommended, just periodic observation
A

PERIAPICAL CEMENTAL DYSPLASIA

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13
Q
  • odontogenic
  • mostly presents in posterior mandible as a slowly growing expansion
  • uni or multilocular radiolucency that contains calcified structures of varying size
  • frequently associated with impacted third molars
  • less aggressive than ameloblastomas
A

CALCIFYING EPITHELIAL ODONTOGENIC TUMOR

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14
Q
  • mixed (odontogenic and mesenchyme)
  • when fully developed, odontomas consist chiefly of enamel and dentin with varying amounts of pulp and cementum
  • often seen in younger patients (both subtypes)
  • compound: multiple single-rooted teeth in a fibrous matrix
  • complex: a mass of mature dentin with enamel matrix (uncalcified enamel) and cementum
A

ODONTOMA

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15
Q
  • mesenchymal
  • derived from dental papilla or dental follicle (which arise from mesenchymal embryologic components)
  • can be unilocular or multilocular with irregular scalloped margins (soap bubble radiolucency)
A

ODONTOGENIC MYXOMA

16
Q
  • odontogenic
  • slow growing, locally invasive aggressive benign tumor
  • thought to arise from cell rests of the enamel organ or an epithelial lining of an odontogenic cyst or from the basal layer of epithelium
A

AMELOBLASTOMA

17
Q
  • mixed (odontogenic, mesenchymal)
  • common in children and teenagers
  • unilocular or multilocular with well defined margins
  • May grow large enough to occupy body of Ramus
  • recurrence sometimes occurs as ameloblastic fibrosarcoma
A

AMELOBLASTIC FIBROMA

18
Q
  • mesenchymal
  • benign
  • patients under 25
  • calcified mass, usually roots of permanent first molars
  • mineralized material(cementum), cementoblastic cells at the periphery
A

CEMENTOBLASTOMA

19
Q
  • odontogenic origin
  • anterior, more common in max than mand
  • often detected when cuspid tooth has failed to erupt
  • can be difficult to differentiate from a dentigerous cyst (but can surround entire tooth, where cyst just surrounds the crown)
  • tubular or duct-like structures are formed by odontogenic epithelium
  • recurrence is rare
A

ADENOMATOID ODONTOGENIC TUMOR

OBIOL 305 (9 decks)

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