Retrieval of a Long Broken File from the MB Canal of the Lower Left Second Molar — Referred Case

Referred case — Lower left second molar (LL7 / FDI #37). A long broken endodontic file was identified within the mesiobuccal (MB) canal, requiring microscopically guided retrieval. Patient Presentation The patient was referred by a general dentist following an instrument separation incident during root canal treatment of the lower left second molar (FDI #37). The patient reported no significant pain at the time of referral. Medical history was non-contributory and no relevant allergies were noted. Radiographic Findings A periapical radiograph was taken upon referral. A radiopaque metallic fragment of notable length was clearly visible within the mesiobuccal canal of tooth #37. The fragment appeared to extend from the coronal third into the mid-root region. Periapical bone levels appeared within normal…