INBDE (Integrated National Board Dental Examination) Practice Exam

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The oblique ridge passes through what surface of the mandibular first molar?

  1. Mesial and Mesial developmental groove

  2. DistoFacial and DF developmental groove

  3. Mesial and Distal developmental groove

  4. DF and D developmental groove

The correct answer is: DF and D developmental groove

The oblique ridge on the mandibular first molar passes through the distofacial (DF) and distal (D) developmental groove. The oblique ridge is a prominent ridge that runs obliquely from the mesiolingual to the distobuccal corner of the occlusal surface on the mandibular molars, and it is a notable anatomical landmark in dental anatomy. It is formed by the union of the triangular ridge of the distobuccal cusp and the distal cusp ridge of the mesiolingual cusp. This ridge plays a role in guiding mandibular movements during occlusion and mastication. Considering the other options: A. The oblique ridge does not pass through the mesial and mesial developmental groove. B. The oblique ridge does not pass through the distofacial and distofacial developmental groove. C. The oblique ridge does not pass through the mesial and distal developmental groove.

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