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5th Oral Disease - Histology Practicals > Cysts > Flashcards

Cysts Flashcards

1
Q

What is dental lamina?

A

Oral epithelium that gives rise to enamel organ of developing tooth

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2
Q

Where are remnants of dental lamina found?

A

Often angle of mandible

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3
Q

What is a follicle?

A

Odonogenic mesenchyme that surrounds unerupted tooth

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4
Q

How is follicle formed?

A

Formed from external and internal epithelium of enamel organ

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5
Q

What are rests of malassez?

A

Remnants of Hertwig’s root sheath and normal components of PDL

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6
Q

What is reduced enamel epithelium?

A

Residual epithelium of enamel organ - attached ACJ

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7
Q

What expect to see radiograph radicular cyst?

A

Large well defined radiolucency
Can be corticated
Continuity w/ PDL

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8
Q

What can be differential of radicular cyst?

A

Periapical granuloma

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9
Q

What look for on histology of radicular cyst if root present?

A

Look root canal system for viable pulp cells - likely to see necrotic

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10
Q

What is main components of cyst?

A

Wall, lining and lumen

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11
Q

What is wall of radicular cyst?

A

Fibrous connective tissue - may see chronic inflammatory cells

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12
Q

What is lining of radicular cyst?

A

Non-keratinised stratified squamous epithelium

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13
Q

Where does radicular cyst originate from?

A

Rest cells of mallassez - remnants of Hertwigs root sheath

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14
Q

What can see in lumen of radicular cyst?

A

Debris

Cholesterol clefts

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15
Q

Why do cholerstoral crystals from?

A

Due extensive cell destruction

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16
Q

Why do radicular cysts form?

A

Non-vital pulp = periapical granuloma
Ongoing inflammation = tissue destruction = granulation tissue formation
Cause proliferation odontogenic epithelium

17
Q

Likely source of epithelium in radicular cyst?

A

Cell rests of malassez - arise in PDL

18
Q

How does epithelium proliferation occur in cyst?

A

Inflammatory infiltrate acts upon epithelium = stimulate grow

19
Q

How goes radicular cyst grow?

A

Accumulation of fluid - hypertonic so draws fluid - this causes pressure in cyst causing expansion

20
Q

Treatment options for radicular cyst?

A

Unrestorable - XLA and enucleatre

Restorable - endodontic and peri-radicular surgery

21
Q

What note when describing radiograph?

A 
General overview inc caries
Radiolucency 
- Definition
- Size
- Extension
- Associated displacement - teeth/ ID
- Associated resorption 
- Corticated
- Expansion
22
Q

Different types of follicular cyst?

A

Dentigerous - associated w/ impacted tooth

Eruption

23
Q

On histology where does follicular cyst attached tooth?

A

ACJ

24
Q

Is any inflammation wall of dentigerous cyst?

A

No

Developmental odontogenic cyst

25
Q

What is wall and lining of dentigerous cyst?

A 
Wall = fibrous connective tissue, no inflammation
Lining = thin non-keratinised SSE
26
Q

Source of lining for dentigerous cyst?

A

Reduced enamel epithelium

27
Q

What teeth are commonly affected by dentigerous cysts?

A

Lower third molars
Maxillary canines
Second mandibular premolars

28
Q

What appearance is common for odontogenic keratocyst on X-ray?

A

Scalloped egden

29
Q

Differential diagnosis for odontogenic keratocyst?

A

Radicular cyst

Odonotgenic tumour

30
Q

Where is most likely site for odontogenic keratocyst?

A

Posterior mandible - most common site of dental lamina

31
Q

What is the epithelial lining of odontogenic keratocyst?

A

Para-keratinised SSE

See nuclei parallel - nuclear palisading

32
Q

Source of epithelium in odontogenic keratocyst?

A

Dental lamina

33
Q

What clinical tests can help establish diagnosis of odontogenic keratocyst?

A

Sensibility testing - rules out radicular cyst
Imaging - if any expansion
Aspiration cyst content

34
Q

Do see expansion with odontgenic keratocyst?

A

No

More likely to see in tumour

35
Q

Why do odontogenic keratocyst recur?

A

Thin fragile lining

Daughter cells

36
Q

What condition is odontgoenic keratocyst often seen in?

A

Gorlin goltz

37
Q

Differential diagnosis for radiolucency in anterior maxilla?

A

Radicualr cyst

Nasopalatine duct cyst

38
Q

What is epithelium on nasopalatine duct cyst?

A

Columnar pseudostatified epithelium (respiratory)

39
Q

Source of epithelium for nasopalatine duct cyst?

A

Remnants of epithelium from fusing of palatine shelf and pre-maxilla

5th Oral Disease - Histology Practicals (8 decks)

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