【Yang Yeh】評論

摘錄自Pathway Ch8 Nonsurgical retreatment p326The incidence of periapical cysts has been reported to be 15% to 42% of all periapical lesions, and determining whether a periapical radiolucency is a cyst or the more common periapical granuloma cannot be done with available radiographic methods. There are two types of periapical cysts: the periapical true cyst and the periapical pocket cyst. True cysts have a contained cavity or lumen within a continuous epithelial lining and are therefore isolated from the tooth, whereas with pocket cysts, the lumen is open to the root canal of the affected tooth. True cysts, due to their self-sustaining nature, probably do not heal following nonsurgical endodontic therapy and usually require surgical enucleation.