PMC4745629_01
Pre-op X-ray.
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IOPAR revealed radiolucency involving enamel, dentin, and pulp with no periapical changes in relation to 46 (Figure 1).
IOPA showing 4 mesial canals.
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The working length was determined with radiographic technique and apex locator (Figure 2).
CBCT image showing 4 canals in mesial root.
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CBCT of the right mandibular molar. CBCT revealed four canals in the mesial root and two canals in distal root (Figures 3 and 4).
CBCT image showing 4 canals in mesial root.
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fig4
CBCT of the right mandibular molar. CBCT revealed four canals in the mesial root and two canals in distal root (Figures 3 and 4).
Intraoral image showing 6 canals.
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On exploration with DG-16 probe, we found 2 additional canals between MB and ML (Figure 5).
Master cone selection.
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At the 3rd appointment, master cone was selected (Figure 6) and obturation was performed using cold lateral compaction technique and AH-plus root canal sealer.  Figure 7 shows the IOPAR immediately after obturation.
IOPAR after obturation.
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fig7
At the 3rd appointment, master cone was selected (Figure 6) and obturation was performed using cold lateral compaction technique and AH-plus root canal sealer.  Figure 7 shows the IOPAR immediately after obturation.