Pulp Chamber & Root Canal Anatomy
- Maxillary first molar — 3 roots; the mesiobuccal root frequently has a second canal (MB2, present in a high percentage of cases).
- Mandibular first molar — 2 roots, commonly 3-4 canals (two mesial + one or two distal).
- C-shaped canal — classically the mandibular second molar (fused roots).
- The maxillary second premolar shows variable canal anatomy.
Clinical Relevance
Missing canals (especially MB2) is a major cause of endodontic failure; magnification and careful access help locate them.
Exam Tips ⭐
Maxillary 1st molar = MB2 common; mandibular 1st molar = 3-4 canals; C-shaped = mandibular 2nd molar.
📝 Practice MCQs — Pulp Chamber & Root Canal Anatomy
Q1. A C-shaped canal is most classically seen in the:
A. Maxillary first molar
B. Mandibular second molar
C. Maxillary canine
D. Mandibular incisor
Show Answer
✅ Answer: B
The mandibular second molar classically has a C-shaped canal.
Q2. The MB2 canal is found in the:
A. Mandibular molar
B. Maxillary first molar mesiobuccal root
C. Maxillary canine
D. Premolar
Show Answer
✅ Answer: B
MB2 lies in the mesiobuccal root of maxillary molars.
Q3. A mandibular first molar commonly has how many canals?
A. 1
B. 2
C. 3-4
D. 5-6
Show Answer
✅ Answer: C
It typically has 3-4 canals (two mesial + one/two distal).
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