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Flashcards in Odontogenic cysts Deck (41):

What is odontogensis?

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


Definition of odontogensis cyst?

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


What it the etiology of Odontogenesis cyst?

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


What are the two types of inflammation cyst

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


What is Primordial cyst

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


Where are primordial cyst found highly

mandibular 3rd molar


Dentigerous Cyst (Follicular Cyst)

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


Where do you mostly see the Dentigerous cyst?

↑ Md3M, ↑ MxCu,asymptomatic, usually no expansion


Radiographic finding of Dentigerous Cyst (Follicular Cyst)

Well circumscribed pericoronal radiolucency. From CEJ around crown.


Histology of Dentigerous Cyst (Follicular Cyst)

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


How to treat DEntigerous cyst

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


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

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


Can Dentigerous cyst be neoplastic
3 types of cancer associated with it?

Exceedingly rare
Squamous cell carcinoma Mucoepidermoid carcinoma


What are the 2 types of periodontal cyst

Apical Periodontal Cyst (radicular cyst)
Lateral Periodontal cyst


What is the most common odontogenic cyst

Apical Periodontal Cyst (radicular cyst)


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

Inflammatory secondary to devitalized pulp


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

Lateral radicular cyst
Residual cyst


Where does Lateral Periodontal cyst arise from
and it found mostly on what tooth

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


What are the radiographic finding in Lateral Periodontal cyst?

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


What is the histologic finding in Lateral Periodontal cyst?

Nonkeratinizing stratified squamous epithelial lining


How to treat Lateral Periodontal cyst?



What are the variation of Lateral Periodontal cyst?

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


Explain Gingival cyst in newborn

3 characteristics?

Is there a treatment for this cyst?

Newborn (dental lamina cyst) Soft tissue cysts on gingiva or alveolar ridge from degenerating dental lamina
1. Very common
2. Congenital or early life
3. Small yellowish elevations
Will self-marsupialize and heal


Explain Gingival cyst in adult
It is common in what tooth

Is there a treatment for this cyst?

cysts of attached gingiva from degeneration of rests or glands of Serres (dental lamina), soft compressible swellings
↑↑ MdCu-Bi clinically similar to mucocele but mucoceles don’t occur on gingiva


Where does Odontogenic Keratocyst originate from?

what is percentage of parakeratinzied cyst?
what is percentage of orthokeratinized cyst?

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


where is parakeratinzied cyst
more common? what age group?

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


what is radiograph and histological finding of parakeratinzied?

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


what is treatment/prognosis of parakeratinized cyst?

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


Basal cell nevus-bifid rib syndrome?

(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.


what are Keratocysts known for?

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


Characteristics of Orthokeratinized odontogenic cyst

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


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

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


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

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


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

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.


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

↑ Md, may be large


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

Inflammatory cyst occurring on buccal of erupting tooth
Paradental Cyst


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

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


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

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


what kind of cyst is odontogensis cyst?

It is developmental not inflammatory


what kind of cyst has Small yellowish elevations

Newborn (dental lamina cyst) on gingival cyst


what is adult gingival cyst clinically similar to?

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