INBDE (Integrated National Board Dental Examination) Practice Exam

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What causes a cleft lip?

  1. Non-fusion of lateral palatine processes

  2. Non-fusion of medial nasal prominences with maxillary prominence

  3. Non-fusion of the nasal septum with maxillary prominence

  4. Non-fusion of the intermaxillary segment with palatine shelves

The correct answer is: Non-fusion of medial nasal prominences with maxillary prominence

A cleft lip is caused by the non-fusion of the medial nasal prominences with the maxillary prominence during embryonic development. This failure of fusion results in a separation or gap in the upper lip, leading to a cleft lip deformity. The other options provided in the question are related to different developmental processes during embryonic development but are not specifically associated with the formation of a cleft lip.

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