ADA NBDE National Board Dental Part II

Answer: C - The two types of facial clefts are the cleft palate and the cleft lip. These makeup half of all defects. The cleft palate is an opening in the mouth’s roof where the palate did not join. The cleft lip is the separation of the two sides of the lips. Both of these clefts can be bilateral or unilateral. Stickler’s, DiGeorge, and Vander Woude’s syndromes are associated with clefts. However, unilateral clefts are nonsyndromic birth defects.