National Dental Examining Board of Canada (NDEB) Practice Exam

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Master your National Dental Examining Board of Canada (NDEB) exams with our comprehensive practice guide. Achieve excellence in your dental certification with expertly crafted questions and detailed explanations.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Cleft lip is caused by the failure of union of which two processes?

Maxillary process and medial nasal process
Maxillary process and lateral nasal process
Mandibular process and medial nasal process
Mandibular process and lateral nasal process

The correct answer is: Maxillary process and medial nasal process

Cleft lip is a birth defect where the lip does not fully form during development in the womb. It is caused by the failure of union between the maxillary process (forms the upper lip and jaw) and the medial nasal process (forms the center part of the face including the nose and upper lip). The other choices are incorrect because they do not involve the maxillary process and the medial nasal process, which are the two processes that are crucial for proper formation of the upper lip. The mandibular process (forms the lower jaw) and the lateral nasal process (forms the sides of the nose) play a different role in development and are not involved in cleft lip formation.