Odontogenic cysts Flashcards
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?
- Inflammation
- Unknown, these are called developmental cysts but are not
inflammatory
What are the two types of inflammation cyst
- 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
MD3M
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?
Ameloblastoma
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?
Excision
What are the variation of Lateral Periodontal cyst?
Botryoid odontogenic cyst – polycystic, multilocular, may recur after removal.
Is there a treatment for this cyst?
- Very common
- Congenital or early life
- ## Small yellowish elevationsWill self-marsupialize and heal
It is common in what tooth
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Is there a treatment for this cyst?
↑↑ MdCu-Bi clinically similar to mucocele but mucoceles don’t occur on gingiva
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Excision
Where does Odontogenic Keratocyst originate from?
what is percentage of parakeratinzied cyst?
what is percentage of orthokeratinized cyst?
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?
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?
- Clinical aggressiveness
- Recurrence after removal
- 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)?
Histologic findings: Fully or partially cystic, cystic epithelium contains ghost cells (prematurely keratinized) which tends to calcify
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Treatment: Conservative surgical removal – low recurrence
Characteristics of VIII. Calcifying odontogenic cyst (Gorlin Cyst)?
= age?
= mandibular or maxillary?
= other name
“Pindborg Tumor” “CEOT”
-what are radiographic, histological and treatment of IX. Glandular Odontogenic Cyst?
Histologic findings: Cyst showing glandular differentiation (mucus cells, columnar epithelium with cilia, lumina)
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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?
Histologic findings: Inflamed cyst lined by stratified squamous epithelium
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Treatment: Enucleation of cyst. If you recognize this clinically which you should, you do not have to extract the to
oth
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
