Periodontitis

Periodontitis is the common sequel to chronic gingivitis and is recognised histologically by evidence of damage to the alveolar bone, associated with signs of chronic inflammation. The bone of the alveolar crest shows resorption as demonstrated by the presence of Hownship's lacunae sometimes still containing multinucleated osteo-clasts. The epithelial attachment that normally lies in contact with the tooth enamel has moved downwards to be partly opposite the enamel and the root cementum or even...

Dentigerous Cyst

A dentigerous cyst (synonymous term follicular cyst) is a cyst that surrounds the crown of an unerupted tooth and is attached to the neck of this tooth (Fig. 9.7). Dentigerous cysts are quite common. In larger series 18 , they comprise almost 17 of all cases, only surpassed by radicular cysts. In most instances, they are associated with the maxillary canine or the mandibular third molar tooth. Dentigerous cysts probably develop by accumulation of fluid between the reduced enamel epithelium and...

Radicular Cyst

Radicular cysts are located at the root tips of teeth in which the pulp has become necrotic, mostly Fig. 9.1 Anatomical relationship between cysts and teeth. From left to right dentigerous cyst surrounding crown of unerupted molar tooth, lateral periodontal cyst lying between roots of healthy teeth and radicular cyst at the root tip of a tooth with carious decay. (From 20 with permission) Fig. 9.1 Anatomical relationship between cysts and teeth. From left to right dentigerous cyst surrounding...

Lateral Periodontal Cyst

Lateral periodontal cysts occur at the lateral aspect or between the roots of vital teeth. They arise Fig. 9.11 Eruption cyst shimmering blue through its Fig. 9.12 Lateral periodontal cyst showing cuboidal epi-thin covering membrane thelium thickening to form a plaque composed of clear Fig. 9.11 Eruption cyst shimmering blue through its Fig. 9.12 Lateral periodontal cyst showing cuboidal epi-thin covering membrane thelium thickening to form a plaque composed of clear from odontogenic epithelial...