Cone Beam Computed Topographic Evaluation and Endodontic Management of a Rare Mandibular First Molar with Four Distal Canals

Figure 1

(a) Preoperative intraoral periapical radiograph 1-distobuccal I, 2-distobuccal II, 3-middistal, and 4-distolingual. (b) Radiograph showing working length determination of six root canals. (c) Master cone radiograph. (d) Postobturation radiograph.

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