Maxillary first molar with an O-shaped root morphology: report of a case

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MeSH: Adult ; Anatomic Variation* ; Apicoectomy/methods ; Cone-Beam Computed Tomography/methods ; Dental Pulp Cavity/diagnostic imaging ; Dental Pulp Cavity/pathology* ; Glass Ionomer Cements/therapeutic use ; Humans ; Male ; Maxilla ; Molar/diagnostic imaging ; Molar/pathology* ; Periapical Periodontitis/therapy ; Retrograde Obturation/methods ; Root Canal Filling Materials/therapeutic use ; Root Canal Preparation/methods* ; Tooth Replantation/methods

Keywords: cone-beam computed tomography scanning ; intentional replantation ; maxillary first molar ; O-shape ; root canal anatomy

Abstract: This case report is to present a maxillary first molar with one O-shaped root, which is an extended C-shaped canal system. Patient with chronic apical periodontitis in maxillary left first molar underwent replantation because of difficulty in negotiating all canals. Periapical radiographs and cone-beam computed tomography (CBCT) were taken. All roots were connected and fused to one root, and all canals seemed to be connected to form an O-shape. The apical 3 mm of the root were resected and retrograde filled with resin-modified glass ionomer. Intentional replantation as an alternative treatment could be considered in a maxillary first molar having an unusual O-shaped root.