INBDE (Integrated National Board Dental Examination) Practice Exam

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How many canals do the majority of maxillary first molars have?

  1. 2

  2. 3

  3. 4

  4. 5

The correct answer is: 4

The majority of maxillary first molars typically have four canals. The maxillary first molar usually has three roots: two buccal roots (mesiobuccal and distobuccal) and one palatal root. These roots commonly contain four canals - two in the mesiobuccal root, one in the distobuccal root, and one in the palatal root. Therefore, the correct answer is C. Options A, B, and D are incorrect because they do not correspond to the typical anatomy of a maxillary first molar.