PMC4007371_01
A = Preoperative periapical 
radiograph of a left mandibular first molar.. B = Periapical radiograph showing 
the working length determination of six root canals.. C = Enlarged axial CBCT image 
section at the mid-root level showing 4 canals in the distal 
root and 2 canals in the mesial root.. D = Enlarged coronal section of the 
distal root showing the configuration of the four canals.. E = Enlarged sagital section of the 
distal root showing the overlapping of the four canals.. F = Postoperative periapical 
radiograph showing all root canals.. G = Six months follow-up of the root 
canal treatment.
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PMC4007371_01_jomr-05-e5-g001.jpg
fig1
Periapical  radiographic examination revealed a deep restoration near distal pulp  horn with no signs of periapical radiolucency and aberrant anatomy  (Figure 1A). Tokyo, Japan) and a radiograph  was taken (Figure 1B). The presence of six canals was confirmed and  pulpectomy was performed. Axial, coronal, and  sagital CBCT slices revealed six canals (four in the distal root and two  in the mesial root) in the referred tooth (Figure 1C - E). Tehran,  Iran) and obturated with gutta-percha (Ariadent, Tehran, Iran) and AH  Plus sealer (Dentsply, Maillefer, Konstanz, Germany) using cold lateral  condensation technique (Figure 1F). Then, the patient was refereed for  crown restoration. Six months after the endodontic treatment, the  patient was asymptomatic (Figure 1G).