• Classically cyst appears as a well defined radiolucent area circumscribed by a radiopaque margin.
• Most cysts are unilocular , however keratocyst usually has a multilocular appearance.
• Cysts usually do not cause resorption of the roots of teeth, but it causes displacement.

• The stimulus that causes resting epithelial cells to proliferate forming cyst is not exactly known .
• Inflammation seems to play a major role in those cysts arising in granuloma from infected dental pulp.

Classificaition

This Classification is the proposed revision of WHO Jaw Cyst Classification.

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Developmental

• Odontogenic
  • Odontogentic Keratocysts (Primodial Cyst).
  • Follicular Cyst (Eruption Cyst).
  • Alveolar Cyst of infants (Gingival Cyst in Adults).
  • Developmental / Lateral Periodontal Cyst.
• Non-Odontogenic
  • Midpalatal cyst of infants.
  • Nasopalatine duct cyst.
  • Nasolabial cyst.

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Inflammatory

• Inflammatory follicular cyst.
• Radicular cyst.
• Inflammatory lateral periodontal cyst

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Types of Cysts

cysts can be divided into three types according the its epithelium origin:

• Odontogenic epithelim: Epithelium responsible for tooth formation, read more.
• Non-odontogenic epithelium: oral epithelium entrapped along lines of fusion of the embryonic processes to form jaws, read more.
• Pseudocysts: Differ from true cyst in that they lack an epithelium lining , read more.

Diffrences

Difference between True Cyst and Pseudo-cyst  can be explained by Dr. Varun Pandula from Juniour Dentist:

Cysts are Pathological cavities that contains (fluid, semi Fluid or gas) which is either lined by epithelium (True Cyst) or not lined by Epithelium (Pseudo-cyst).

Difference between a Cyst and Neoplasm

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Cyst

• Sac filled with fluids or gas
• Will usually feel soft.
• Will usually feel soft.
• Lining by epithelium.
• Painless.
• Slow growing.
• Mainly benign.
• Rarely cause resorption of adjacent tooth but mainly causes displacement.

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Neoplasm

• Solid Mass of tissues.
• Often Hard.
• May appear as a thin layer of flattened stratified squamous epithelium like.
• Tend to be painful.
• Rapidly growing.
• Either benign or malignant.
• Causes resorption of adjacent teeth.

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Common Type

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