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periapical periodontitis
Periapical periodontitis (also termed apical periodontitis, AP, or periradicular peridontitis) is an acute or chronic inflammatory lesion around the apex of a tooth root which is caused by bacterial invasion of the pulp of the tooth. The term is derived from ''peri-'' meaning "around", ''apical'' referring to the apex of the root (the tip of the root), and ''-itis'' meaning a disease characterized by inflammation. Periapical periodontitis can be considered a sequela in the natural history of dental caries (tooth decay), irreversible pulpitis and pulpal necrosis, since it is the likely outcome of untreated dental caries, although not always. Periapical periodontitis may develop into a periapical abscess, where a collection of pus forms at the end of the root, the consequence of spread of infection from the tooth pulp (odontogenic infection), or into a periapical cyst, where an epithelial lined, fluid filled structure forms.
== Radiographic features==
The radiographic features of periapical inflammatory lesions vary depending on the time course of the lesion. Because very early lesions
may not show any radiographic changes, diagnosis of these lesions relies solely on the clinical symptoms . More chronic lesions may show lytic (radiolucent) or sclerotic (radiopaque) changes, or both.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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