Non-surgical Retreatment of a Taurodont Molar with Maxillary Sinusitis of Endodontic Origin: A Case Report
Keywords:
additional canal, maxillary molar, maxillary sinusitis, non-surgical retreatment, taurodontismAbstract
Taurodontism is a dental anomaly characterized by an apically displaced pulpal floor and an elongated pulp chamber, which complicates root canal treatment due to its atypical root morphology. This case report presents the nonsurgical root canal retreatment of a taurodont maxillary first molar with an additional mesiobuccal canal associated with maxillary sinusitis of endodontic origin (MSEO). A 57-year-old male patient presented with dull pain at tooth 16, which had previously undergone root canal therapy. Clinical examination revealed dislodgement restoration with gutta-percha exposure, tenderness to percussion, and radiographic evaluation demonstrated underfilled root canals with periapical radiolucencies around the mesiobuccal and distobuccal roots. Cone-beam computed tomography (CBCT) confirmed the taurodont morphology, detected an additional canal, and revealed Periapical Osteoperiostitis (PAO). Under a dental operating microscope, all five canals (MB1, MB2, MB3, DB, and P) were negotiated, cleaned, and shaped using rotary instrumentation and supplemental irrigation. Calcium hydroxide was placed as an intracanal medicament, and obturation was performed using a hydraulic condensation technique with a bioceramic sealer. The patient remained asymptomatic after retreatment, and 2-year follow-up radiographs demonstrated complete periapical and sinus healing. This case highlights the importance of CBCT and magnification in identifying complex root canal morphology and achieving favorable outcomes in the retreatment of taurodont teeth with MSEO.
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