INBDE (Integrated National Board Dental Examination) Practice Exam

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Permanent mandibular first molar arises from how many lobes?

  1. 4

  2. 5

  3. 6

  4. 7

The correct answer is: 5

The permanent mandibular first molar typically arises from five lobes. These lobes are the mesiobuccal, distobuccal, mesiolingual, distolingual, and the fifth or distal lobe, which is specific to the mandibular first molar. These five lobes contribute to the development of the crown of the tooth, with the distal lobe being a distinguishing feature of this particular tooth. This differentiation in lobe count is why option B is the correct answer. Options A, C, and D are incorrect because the permanent mandibular first molar does not typically arise from 4, 6, or 7 lobes.

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