A. Missed fourth canal
B. Vertical root fracture
C. Periodontal involvement of pulpal lesion
D. None of the above
The correct answer is A. Missed fourth canal.
- It's a standard to mention now that's maxillary first molar has fourth canal, the MB2 in 54% of cases.
- The mandibular first molar is the tooth which needs RCT most commonly, but it's the maxillary first molar which has the most number of failed RCT.
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