Endodontic Management of a Mandibular First Molar with Four Canals in a Distal Root by Using Cone-Beam Computed Tomography: a Case Report

• Main Authors: Hani Baziar (Author), Farzaneh Daneshvar (Author), Abbas Mohammadi (Author), Hamid Jafarzadeh (Author)
• Format: Book
• Published: Stilus Optimus, 2014-04-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 10.5037/jomr.2014.5105; 2029-283X
• Keywords: anatomy; cone-beam computed tomography; molar; tooth root; tooth canal; Dentistry; RK1-715
• Source: eJournal of Oral Maxillofacial Research, Vol 5, Iss 1, p e5 (2014)

Background: Aberrations in the root canal anatomy are clinically challenging for clinicians. Mandibular first molars usually have 2 roots and 3 or 4 canals, but various combinations may exist. A distal root with three canals is rare and its incidence in literature is about 0.2 - 3%. As a diagnostic tool, cone-beam computed tomography (CBCT) may be a better choice for diagnosis of extra roots or canals comparing to conventional radiography. Methods: An endodontic management of a mandibular first molar with six canals was performed. CBCT was used to confirm the diagnosis and to understand the morphology of the canals. Results: Evaluation of the axial and coronal slices of CBCT images confirmed the presence of 2 roots and 6 canals. The distal root had four distinct root canal orifices with two apical foramens, being described as type XIV canal configuration. Conclusions: Dentists should be aware of unexpected canal morphology when performing endodontic treatment. The present case demonstrated the use of CBCT in diagnosis and negotiation of extra canals in a mandibular first molar.