Odontogenic cysts

Question 1

What is odontogensis?

Answer 1

Odontogenesis starts with surface ectoderm (epithelium) growing into jaw (dental lamina) and producing the tooth germ, a portion of which is the enamel organ.

Question 2

Definition of odontogensis cyst?

Answer 2

Pathologic cavity lined by odontogenic epithelium and filled with fluid or semisolid material

Question 3

What it the etiology of Odontogenesis cyst?

Answer 3

1. Inflammation
2. Unknown, these are called developmental cysts but are not
   inflammatory

Question 4

What are the two types of inflammation cyst

Answer 4

1. Radicular cyst

2. buccal bifurcation cyst are inflammatory, all the rest are developmental

Question 5

What is Primordial cyst

Answer 5

Cyst arising from degeneration of enamel organ prior to tooth formation aborts odontogenesis resulting in radiolucency in place of a missing tooth. ↑↑ Md3M.

Question 6

Where are primordial cyst found highly

Answer 6

MD3M

mandibular 3rd molar

Question 7

Dentigerous Cyst (Follicular Cyst)

Answer 7

Cyst resulting from separation of the follicle from around the crown of developing toot

Question 8

Where do you mostly see the Dentigerous cyst?

Answer 8

↑ Md3M, ↑ MxCu,asymptomatic, usually no expansion

Question 9

Radiographic finding of Dentigerous Cyst (Follicular Cyst)

Answer 9

Well circumscribed pericoronal radiolucency. From CEJ around crown.

Question 10

Histology of Dentigerous Cyst (Follicular Cyst)

Answer 10

Stratified squamous epithelium without keratinization (this was originally the ameloblasts which following odontogenesis becomes reduced enamel epithelium).

Question 11

How to treat DEntigerous cyst

Answer 11

urgical removal of tooth and cyst if 3M. For Cu may be able to decompress and pull Cu in orthodontically

Question 12

What are the two types of Dentigerous Cyst (Follicular Cyst)

Answer 12

A. Eruption cyst – a dentigerous cyst that gets pushed into oral cavity by erupting tooth, may treat with decompression so tooth can erupt
B. Lateral - ↑Md 3M – laterally placed

Question 13

Can Dentigerous cyst be neoplastic

3 types of cancer associated with it?

Answer 13

Ameloblastoma
Squamous cell carcinoma Mucoepidermoid carcinoma

Question 14

What are the 2 types of periodontal cyst

Answer 14

Apical Periodontal Cyst (radicular cyst)

Lateral Periodontal cyst

Question 15

What is the most common odontogenic cyst

Answer 15

Apical Periodontal Cyst (radicular cyst)

Question 16

What kind of cyst is Apical Periodontal Cyst (radicular cyst) ?

Answer 16

Inflammatory secondary to devitalized pulp

Question 17

Two types of Apical Periodontal Cyst (radicular cyst) which is a most common odontogenic cyst

Answer 17

Lateral radicular cyst

Residual cyst

Question 18

Where does Lateral Periodontal cyst arise from

and it found mostly on what tooth

Answer 18

arises from cystic degeneration of rests of Malassez in PDL. Teeth vital, ↑↑ MdCu-Bi.

Question 19

What are the radiographic finding in Lateral Periodontal cyst?

Answer 19

Small well circumscribed radiolucency along lateral root surface of vital tooth.

Question 20

What is the histologic finding in Lateral Periodontal cyst?

Answer 20

Nonkeratinizing stratified squamous epithelial lining

Question 21

How to treat Lateral Periodontal cyst?

Answer 21

Excision

Question 22

What are the variation of Lateral Periodontal cyst?

Answer 22

Botryoid odontogenic cyst – polycystic, multilocular, may recur after removal.

Question 23

Is there a treatment for this cyst?

Answer 23

1. Very common
2. Congenital or early life
3. ## Small yellowish elevationsWill self-marsupialize and heal

Question 24

It is common in what tooth
—–

Is there a treatment for this cyst?

Answer 24

↑↑ MdCu-Bi clinically similar to mucocele but mucoceles don’t occur on gingiva
—————————————
Excision

Question 25

Where does Odontogenic Keratocyst originate from? what is percentage of parakeratinzied cyst? what is percentage of orthokeratinized cyst?

Answer 25

developmental cyst from dental lamina ------------------------------------- 90% parakeratinized 10% orthokeratinized (orthokeratinized odontogenic cyst)

Question 26

where is parakeratinzied cyst | more common? what age group?

Answer 26

All ages, ↑ 2-3 and 6-7 decades, Md:Mx, 2:1, ↑ post Md. 1⁄4 expansion ± drainage and pain, clinically aggressive

Question 27

what is radiograph and histological finding of parakeratinzied?

Answer 27

Radiographic findings: Unilocular or multilocular radiolucency, commonly mimics other types of odontogenic cysts. ----------- Histologic findings: Parakeratotic stratified squamous epithelial lining with well developed and palisaded and hyperchromatic basal cells; often daughter or microcysts in the wall

Question 28

what is treatment/prognosis of parakeratinized cyst?

Answer 28

Conservative surgical removal to resection to decompression. | About 1/3 recur

Question 29

Basal cell nevus-bifid rib syndrome?

Answer 29

(Nevoid basal cell carcinoma syndrome) About 5% of patients with keratocyst have, almost all multiple OKCs Autosomal dominant (mutation of a tumor suppressor gene 9q22), basal cell carcinomas (not nevi; not limited to sun-exposed areas or elderly), calcification of falx cerebri, bone anomalies (bifid ribs), OKCs usually multiple, pits in palms and soles.

Question 30

what are Keratocysts known for?

Answer 30

1. Clinical aggressiveness 2. Recurrence after removal 3. Association with basal cell nevus-bifid rib syndrome

Question 31

Characteristics of Orthokeratinized odontogenic cyst

Answer 31

Smaller, less aggressive, minimal recurrence, not associated with syndrome

Question 32

What are radiographic, histological and treatment of VIII. Calcifying odontogenic cyst (Gorlin Cyst)?

Answer 32

Radiographic findings: Radiolucent to mixed radiolucent/opaque ------------------------------------- Histologic findings: Fully or partially cystic, cystic epithelium contains ghost cells (prematurely keratinized) which tends to calcify ------------------------------------------- Treatment: Conservative surgical removal – low recurrence

Question 33

Characteristics of VIII. Calcifying odontogenic cyst (Gorlin Cyst)? = age? = mandibular or maxillary? = other name

Answer 33

Any age, ↑ Md, maybe associated with unerupted teeth or odontomas. Asymptomatic, rarely expansion, occur extraosseously ------------- “Pindborg Tumor” “CEOT”

Question 34

-what are radiographic, histological and treatment of IX. Glandular Odontogenic Cyst?

Answer 34

Radiographic findings: Unilocular to multilocular radiolucency ----------------------------- Histologic findings: Cyst showing glandular differentiation (mucus cells, columnar epithelium with cilia, lumina) ------------------------------------- Treatment: Surgical excision 30-50% recurrence.

Question 35

what is characteristic of Glandular Odontogenic Cyst? where doe it occur?

Answer 35

↑ Md, may be large

Question 36

Where does Buccal Bifurcation Cyst Paradental Cyst | occur and what kind of cyst is it?

Answer 36

Inflammatory cyst occurring on buccal of erupting tooth | Paradental Cyst

Question 37

In what teeth does Buccal Bifurcation Cyst Paradental Cyst occur? children or adults?

Answer 37

↑↑↑ children | ↑↑ Md1M (often enamel extension into furcation) Buccal swelling

Question 38

Radiographic, histological and treatment of Buccal Bifurcation Cyst Paradental Cyst?

Answer 38

Radiographic findings: unilocular lucency involving furcation of roots Occlusal films: buccal location ---------------------------- Histologic findings: Inflamed cyst lined by stratified squamous epithelium --------------------- Treatment: Enucleation of cyst. If you recognize this clinically which you should, you do not have to extract the to oth

Question 39

what kind of cyst is odontogensis cyst?

Answer 39

It is developmental not inflammatory

Question 40

what kind of cyst has Small yellowish elevations

Answer 40

Newborn (dental lamina cyst) on gingival cyst

Question 41

what is adult gingival cyst clinically similar to?

Answer 41

clinically similar to mucocele but mucoceles don’t occur on gingiva