Non-Surgical Endodontic Retreatment of a Mandibular First Molar with Complex Anatomy

A mandibular first molar presented for non-surgical endodontic retreatment due to persistent endodontic problems associated with an inadequate previous root canal treatment. Pre-operative assessment revealed insufficient root canal obturation, an untreated Radix Entomolaris (RE), and a separated instrument within the mesiobuccal (MB) canal. Pre-operative radiograph showing inadequate previous obturation, an untreated Radix Entomolaris canal, and a separated instrument in the MB canal. Following rubber dam isolation, the previous restorative material and root canal filling were carefully removed to allow thorough assessment of the existing canal anatomy. The pulpal floor was meticulously inspected, revealing the previously untreated Radix Entomolaris canal. The RE canal was identified, negotiated, and incorporated into the retreatment. The separated instrument within the MB canal was carefully managed…