Dental cysts can be caused by inflammatory factors or developmental factors. Common dental cysts include root-end cysts, dentin-containing cysts, and odontogenic keratocysts, as follows.
1. Root-end cyst: it is the periapical granuloma under the stimulation of inflammation caused by the epithelial residual hyperplasia in the periodontium, and the central part of the hyperplastic epithelium undergoes liquefaction and denaturation, forming a cyst.
2. Dental cysts: after the development and formation of the crown and root of the tooth, fluid retention occurs between the shrunken enamel epithelium and the crown of the tooth, forming a cyst.
3. odontogenic keratocyst: the remnants of the original tooth germ or plate in the periodontal tissue form cysts under the stimulation of inflammation, and there are also some odontogenic keratocysts whose formation is related to genetic factors.