Non-surgical Retreatment of a Taurodont Molar with Maxillary Sinusitis of Endodontic Origin: A Case Report

Supitchaya Techachan, Tadkamol Krongbaramee, Anat Dewi — Wed, 24 Jun 2026 00:00:00 +0700

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.

Non-surgical root canal retreatment: a case report of eleven silver cones removal in maxillary first premolar

Theerapon Nuntakarat, Sirawut Hiran-us — Wed, 24 Jun 2026 00:00:00 +0700

Modern endodontic therapy dismissed the use of silver cones as root canal filling due to their corrosion susceptibility, which ultimately leads to endodontic failure. When non-surgical retreatment is required, removal of silver cones can be challenging and potentially cause separation into fragments which may complicate retreatment procedures. This case report showcase a 68-year-old female patient, in which a sinus tract was found at the root apex of maxillary right first premolar tooth with local argyrosis in the corresponding region, which the patient was unaware of the condition. Radiographically, laterally condensed silver cones were suspected in the root canals, with radiolucency presented the apex. Eleven silver cones were successfully retrieved from both canals without any fragmentation or separation by engaging with Hedstrom files combined with braiding technique. Sinus tract was resolved following root canal disinfection procedures, and radiographic evidence indicated ongoing periapical healing after a one-year follow-up.

Thai Endodontic Journal

Non-surgical Retreatment of a Taurodont Molar with Maxillary Sinusitis of Endodontic Origin: A Case Report

Non-surgical root canal retreatment: a case report of eleven silver cones removal in maxillary first premolar