INBDE (Integrated National Board Dental Examination) Practice Exam

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How many roots and canals does the maxillary second premolar usually have?

  1. 1 root with 2 canals, 50% have 1 canal

  2. 1 root with 1 canal, 50% have 2 canals

  3. 2 roots with 1 canal, 50% have 2 canals

  4. 2 roots with 2 canals

The correct answer is: 1 root with 1 canal, 50% have 2 canals

The maxillary second premolar usually has 1 root with 1 canal, but there is a chance of having a variations in the root canal anatomy with 50% of cases having 2 canals. Option A is incorrect because it states that 50% have 1 canal while the correct answer is that 50% have 2 canals. Option C is incorrect because it states that there are 2 roots, which is not typical for the maxillary second premolar. Option D is incorrect because it states that 2 roots and 2 canals are present, which is not typical for this tooth.

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