Two Broken Files Retrieval from MB2 Canal with Minimal Dentin Sacrifice — Referred Case

Separated instruments in the root canal system remain one of the most challenging complications in endodontic practice. When instrument fracture occurs within a curved, narrow canal such as the mesiobuccal second (MB2) canal of a maxillary molar, the risks of iatrogenic damage during retrieval — including excessive dentin removal, strip perforation, and ledge formation — are significantly amplified. This case presents the successful retrieval of two separated files from the MB2 canal of a referred patient, accomplished under dental operating microscope (DOM) guidance with a conservative, dentin-preserving approach. Case Presentation A patient was referred from a general dental practice following the sequential fracture of two rotary nickel-titanium files in the MB2 canal of the maxillary first molar during initial root…