title: Methods for removing metal obstructions from the root canal.
abstract: The removal of metallic obstructions is an important part of endodontic retreatment procedures and encounters a number of serious problems. Sometimes removal procedures are extremely easy and can be performed in rather short time, but often it is a very tedious and time-consuming operation with a high number of failures, especially with fractured instruments. Using special devices such as the Masserannkit, the Canal-Finder-System, or ultrasonic systems some fractured instrument cases can be managed successfully. The retreatment of dowel-obturated root canals or failing silver cone cases has a good prognosis and a fairly good success rate. The Masserannkit, post pullers, the Canal-Finder-System and ultrasonic systems have been shown to be helpful devices in removal of root posts and silver cones. Additionally a large number of special devices and techniques for the removal of metal obstructions from the root canal have been described in the literature and will be critically reviewed.
authors.affiliation: Department of Operative Dentistry, University of Göttingen, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Hülsmann
mesh_terms: D017005:Dental Debonding; D003786:Dental Pulp Cavity; D005547:Foreign Bodies / Q000628:therapy*; D006801:Humans; D008670:Metals; D011176:Post and Core Technique / Q000295:instrumentation*; D012390:Root Canal Therapy / Q000295:instrumentation* / Q000379:methods*
chemical_list: D008670:Metals