title: Clinical, radiographic, and histologic study of endodontic treatment failures.
abstract: One hundred fifty cases of endodontic treatment failures were studied clinically, radiographically, and histologically. Fifty-seven percent of the teeth were asymptomatic. Pain alone and/or associated with swelling was present in 21% of the teeth. There was no correlation between the size of periradicular rarefaction and the occurrence or severity of clinical signs and/or symptoms. Stainable bacteria were demonstrated in 69% of the teeth and were present mostly in the canal. The severity of periradicular inflammation was related to presence of stainable bacteria in the canal. Swelling and pain or a draining sinus tract was often associated with stainable bacteria inside the canal. The development of a radicular cyst associated with an endodontically treated tooth that has failed is not necessarily the cause of endodontic treatment failure.
authors.affiliation: Department of Endodontics, New Jersey Dental School, University of Medicine and Dentistry of New Jersey, Newark.
authors.forename: L M
authors.initials: LM
authors.lastname: Lin
authors.forename: E A
authors.initials: EA
authors.lastname: Pascon
authors.forename: J
authors.initials: J
authors.lastname: Skribner
authors.forename: P
authors.initials: P
authors.lastname: Gängler
authors.forename: K
authors.initials: K
authors.lastname: Langeland
mesh_terms: D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging / Q000382:microbiology / Q000473:pathology; D003790:Dental Pulp Necrosis / Q000209:etiology; D004487:Edema / Q000209:etiology; D006801:Humans; D011859:Radiography; D012390:Root Canal Therapy / Q000009:adverse effects*; D014098:Toothache / Q000209:etiology