ch 15

Question 1

What’s an odontogenic cyst?

Answer 1

cavity lined by odontogenic epithelium and filled with fluid

Question 2

Where does the odontogenic epithelium come from?

Answer 2

Dental lamina (rests of serres)

Question 3

What's a dentigerous cyst?
How common is it?
Where does it attach?
Is it painful?
What tooth is most common?

Answer 3

A unilocular cyst surrounding the crown of unerupted impacted tooth. 
Most common odontogenic cyst. 
CEJ.
Not painful. 
3rd molar.

Question 4

What’s an eruption cyst?
Where does it appear?
Why does it happen?
What does it look like?

Answer 4

The same as dentigerous cyst but in soft tissue.
children younger than 10.
trauma from erupted tooth.
Blue bump on the gums.

Question 5

What the odontogenic keratocyst? (keratocystic odontogenic tumor).
What recurrence rate?
what are they associated with?
Which direction does it grow?
What does it look like? (smaller vs larger)
Histology?

Answer 5

Similar to dentigerous cyst but not always around unerupted crowns.
30% recurrence rate.
Associated with a syndrome (gorlin syndrome).
anterior to posterior growth.
Small: unilocular Larger: multilocular.
Basal cell layer is palisaded (standing upright) and hyperchromatic (darker blue), Epithelium have wavy parakeratin (nucleated)

Question 6

What is gorlin syndrome aka?

What is common with it? 4 things.

Answer 6

Nevoid Basal cell carcinoma syndrome.
Multiple basal cell carcinomas
Multiple odontogenic keratocysts
calcification of falx cerebri
Rib anomalies.

Question 7

DON'T NEED TO KNOW!!!What is orthokeratinized odontogenic cyst?
What age?
How many lucules?
Area it occurs?
What is orthokeratin?

Answer 7

orthokeratinized lining and no basal palisade cyst. 
young adults. 
Unilocular
Posterior mandible. 
No nuclei

Question 8

Gingival cyst of the adult?
Where is it?
What does it look like?

Answer 8

The soft tissue counterpart of the lateral periodontal cyst.
Mandibular, premolar, canine.
Blue fluid filled bump on the gingiva, lateral root cyst.

Question 9

Lateral periodontal cyst? (need to know this CPC)
What’s it similar to? but how’s it different?
Where does it occur?
What’s it look like xray?
How many locules?

Answer 9

development odontogenic cyst on the lateral root surface in between roots.
Gingival cyst of the adult, it’s intrabony.
Canine-premolar area.
radiolucent circle between canine premolar roots.
Multi-locular grapelike (botroid)

Question 10

What’s a Calcifying odontogenic cyst? (Gorlin cyst).
Where’s it found?
What’s it look like Xray?

Answer 10

Calcifying cyst.
Incisor-Canine area.
Flecks of calcification in cyst.

Question 11

Glandular odontogenic cyst appearance?

Recurrence?

Answer 11

Multilocular Anterior mandible crosses the midline.

30%.

Question 12

Buccal bifurcation cyst appearance?
What age is most likely?
Where is it?

Answer 12

root apex is pushed towards the lingual because the cyst occurs on the buccal.
10 years old.
buccal bifurcation of molars.

Question 13

Where does carcinoma arise from? what type of tissue?

Answer 13

epithelium.

Question 14

What’s the only epithelium within bone?

Answer 14

odontogenic stuff.

Question 15

What does carcinoma arise from within jaws??

Answer 15

odontogenic cysts

Question 16

What do odontogenic carcinoma’s look like radiographically?

Answer 16

irregular xray border

Question 17

Ameloblastoma?

Three different types?

Answer 17

Most common clinically significant odontogenic tumor.

1. conventional solid or multilocular (85%)
2. Unicystic 15%
3. Peripheral 1%

Question 18

When do ameloblastoma's occur?
Location?
How to find it and is it symptomatic?
Xray appearance?
What happens to roots?
What happens to buccal lingual cortical bone?
What's different about the Desmoplastic type?
Histology?
Treatment?

Answer 18

30-70’s.
85% in mandible molar ramus.
Asymptomatic, xray
Multilocular, soap bubble or honeycomb.
Roots resorb.
buccal lingual cortical expansion.
desmoplastic more likely anterior maxilla.
Histo: palisading, hyperchromatic basal layer, “red, white and blue pattern”, Reverse polarity.
Treatment: resection of the bone 1.5 cm beyond the border.

Question 19

Multilocular radiolucency differential?

Answer 19

Ameloblastoma.
Odontogenic keratocyst.
Central giant cell granuloma.

Question 20

If an impacted tooth is present in multilocular radiolucency what’s the differential?

Answer 20

Dentigerous cyst.
Ameloblastoma.
Odontogenic keratocyst.
Central giant cell granuloma.

Question 21

DON’T NEED TO KNOW!!!Peripheral ameloblastoma appearance?

Treatment, recurrence.

Answer 21

pink bump on the gums.

Excision, no recurrence.

Question 22

DON’T NEED TO KNOW!!!What’s the difference in malignant ameloblastoma and Ameloblastic Carcinoma?

Answer 22

Malignant: metastatic in another part of the body.
Carcinoma: malignant

Question 23

DON’T NEED TO KNOW!!!Ameloblastic carcinoma xray appearance?

Answer 23

ill-defined margins and cortical destruction.

Question 24

Adenomatoid odontogenic tumor location?
Gender?
tooth involved?
Xray appearance?

Answer 24

anterior maxilla.
Female.
unerupted canine.
unilocular RL around unerupted tooth with snowflake calcifications.

Question 25

Calcifying epithelial odontogenic Tumor (Pindborg Tumor) appearance?
Xray appearance?
Histology and test used (color shown)?
What are the ring calcifications around the histology?

Answer 25

contains calcified structures of varying size and density. (Driven Snow).
Well define benign looking tumor.
Amyloid like material tested by Congo Red becomes apple green.
Liesegang rings.

Question 26

Differential for mixed radiolucency/opacity? calcifications

Answer 26

COC
AOT
AFO
CEOT

Question 27

DON’T NEED TO KNOW!!!What’s the malignant counterpart of ameloblastic fibroma?

Answer 27

Ameloblastic fibrosarcoma

Question 28

What’s the most common odontogenic tumor?

Answer 28

Odontoma

Question 29

Odontoma appearance.
Age?
Compound?

Answer 29

Looks like multiple small teeth.
15 years old.
Compound: multiple small teeth.
Complex: big mass that kinda looks like a tooth.