[Persistent pain following endodontic treatment].

Dental pain is a very common pain in the orofacial area. Patients sometimes experience persistent pain following endodontic treatment. The cause of this pain can be found in the endodontically treated tooth itself when the pain persists after an inadequately performed treatment. Persistent pain is also possible after an apparently adequate endodontic treatment. Moreover the pain can have an odontogenic origin, in cases where the diagnostic procedure may have failed. A non-odontogenic cause can be located in proximate or more remote structures, which may be a question of systemic diseases or pain from neuropathic, neurovascular and/or psychogenic conditions. A thorough clinical examination forms the basis for the establishment of a valid diagnosis.