A novel magnetisation technique for the retrieval of a separated stainless-steel bur from an open apex upper lateral incisor: a case report

Instrument separation during endodontic treatment can present significant challenges, particularly in teeth with complex anatomy and open apices where conventional retrieval techniques carry a high risk of further apical displacement or dentine loss. We present a patient with a necrotic maxillary lateral incisor affected by dens invaginatus and an open apex in which the tip of a stainless steel bur became separated and displaced apically during access preparation. Conventional retrieval methods were deemed unsuitable due to the canal morphology and risk of extrusion. A neodymium magnet was coupled to a hand file and used under magnification to atraumatically attract and retrieve the fragment in a single controlled motion. Following successful removal, an apical barrier of mineral trioxide aggregate was placed and the canal obturated with thermoplasticised gutta-percha. Healing was uneventful. This case highlights the potential of magnetic retrieval as a minimally invasive technique in endodontics, offering a conservative alternative when conventional approaches are impractical or high risk.