INBDE (Integrated National Board Dental Examination) Practice Exam

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What percentage of mandibular 1st premolars have a 2nd canal?

  1. 20%

  2. 30%

  3. 40%

  4. 50%

The correct answer is: 30%

The percentage of mandibular 1st premolars that have a second canal varies, but it is generally accepted that approximately 30% of these teeth have a second canal. This means that the options A, C, and D are incorrect as they either underestimate or overestimate the percentage of mandibular 1st premolars with a second canal. It is important for dental professionals to be aware of this second canal in order to properly diagnose and treat any potential tooth-related issues.

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