Changes

==Introduction==

==Introduction==

A '''dentigerous cyst''' is a developmental odontogenic cyst. The cyst surrounds the crown of an unerupted tooth and is attached to the cemento-enamel junction of the tooth. <font color="red">(pic16dentcyst)</font color> It is essentially a cystic enlargement of the dental follicle after completion of enamel formation.  

A '''dentigerous cyst''' is a developmental odontogenic cyst. The cyst surrounds the crown of an unerupted tooth and is attached to the cemento-enamel junction of the tooth. It is essentially a cystic enlargement of the dental follicle after completion of enamel formation.  

==Aetiology==

==Aetiology==

The stimulus that initiates cystic change is unknown <font color="red">(Cawson et al, 1999; Neville etal., 2002)</font color>.<br>

The stimulus that initiates cystic change is unknown <ref name="Cawson">Cawson, Binnie, Barret, Wright (2001) '''Oral Disease''' 3rd Edition ''Mosby''</ref><ref name="Neville">Neville, B., Damm, D., Allen, C., Bouquot J. (2002) '''Oral and Maxillofacial Pathology.''' 2nd Edition ''Saunders''</ref><br>

The cyst develops as a result of fluid accumulation between the [[Enamel Organ#Crown|crown]] of the tooth and the retained epithelium. The cyst increases in size due to increased osmolarity as a result of the passage of inflammatory cells and desquamated epithelial cells into the cystic lumen. Influx of fluid along this osmotic gradient thereby creates centrifugal growth of the cyst. In human dentistry, dentigerous cysts frequently affect teeth that erupt late <font color="red">(Cawson et al.,1999; Neville et al.,2002</font color>. This does not seem to be the case in veterinary dentistry.

The cyst develops as a result of fluid accumulation between the [[Tooth - Anatomy & Physiology#Crown|crown]] of the tooth and the retained epithelium. The cyst increases in size due to increased osmolarity as a result of the passage of inflammatory cells and desquamated epithelial cells into the cystic lumen. Influx of fluid along this osmotic gradient thereby creates centrifugal growth of the cyst. In human dentistry, dentigerous cysts frequently affect teeth that erupt late <ref name="Cawson" /><ref name="Neville" />. This does not seem to be the case in veterinary dentistry.

==Clinical Signs==

==Clinical Signs==

==Diagnosis==

==Diagnosis==

[[Intra-Oral Radiography|'''Radiographic]] features''' include a well-defined, usually unilocular, area of radiolucency with a sclerotic margin. The area contains the radiodense crown of the unerupted tooth.  

[[Intra-Oral Radiography - Small Animal|'''Radiographic]] features''' include a well-defined, usually unilocular, area of radiolucency with a sclerotic margin. The area contains the radiodense crown of the unerupted tooth.  

'''Histopathology''' is necessary to confirm the diagnosis. Histology differentiates dentigerous cysts from odontogenic keratocysts, ameloblastomas ([[Ameloblastoma, Central|central]] or [[Ameloblastoma, Peripheral|peripheral]]) or [[Squamous Cell Carcinoma|squamous cell carcinomas]].

'''Histopathology''' is necessary to confirm the diagnosis. Histology differentiates dentigerous cysts from odontogenic keratocysts, ameloblastomas ([[Ameloblastoma, Central|central]] or [[Ameloblastoma, Peripheral|peripheral]]) or [[Squamous Cell Carcinoma|squamous cell carcinomas]].

Treatment is usually curative if careful enucleation of the cyst together with the unerupted tooth is performed.

Treatment is usually curative if careful enucleation of the cyst together with the unerupted tooth is performed.

[[Category:Developmental Dental Conditions]]

[[Category:Developmental Dental Conditions]]

[[Category:To Do - Dentistry Images]]

[[Category:Waltham reviewed]]

[[Category:To Do - Dentistry questions]]