Non-Surgical Retreatment of Mandibular Molars with Broken File Retrieval and Complex Apical Anatomy

A patient was referred to our clinic complaining of pain on biting and persistent discomfort. Clinical examination revealed inflamed gingival tissues, detached interdental papilla, and tenderness to percussion associated with the involved teeth. CBCT evaluation revealed multiple endodontic complications, including: • A separated instrument in the MB canal • Short obturation • Missed canals • Deep apical split in the distal canal of the mandibular first molar, adding significant complexity to the case • In the mandibular second molar, previous retreatment attempts failed to progress beyond the coronal portion due to severe canal calcification Treatment was performed following the principles of Microscopia protocol, emphasizing magnification, conservative access, and predictable retreatment workflow. The treatment sequence included: • Removal of all previous…