Single Root with C-shaped Canal Configuration in all the Posterior Teeth of a Patient: A Rare Case Report

Cone Beam Computed Tomography (CBCT) allows three-dimensional evaluation of external root morphology and internal canal configuration of teeth thus allowing accurate diagnosis of rare complexities in the root canal system. This case study presented root canal re-treatment of a maxillary first molar #16 of a 29 years old female patient, wherein, thorough radiographic examination revealed single root morphology in all the teeth. CBCT analysis confirmed the root form and root canal configuration. Endodontic retreatment of the #16 was performed. The maxillary first molars had double fused roots with C-shaped canal configuration while maxillary second and third molars had O-shaped canals with single roots bilaterally. The mandibular first molars had two completely fused roots with C-shaped canal configuration. While the mandibular second and third molars also had C-shaped canal configuration with single roots. The canal configuration of maxillary and mandibular molars was classified according to Martin’s and Fan’s classification respectively. This unique finding of single and double fused roots with C-shaped canal configuration in the posterior teeth in a single patient has rarely been reported in literature.