ADA NBDE National Board Dental Part II

Answer: D - Cleft lip occurs during the fifth and sixth weeks of pregnancy. It is due to the maxilla and frontonasal processes failing to integrate. It is most often seen on the left-hand side of the face in males. Treatment is normally at >10 weeks after birth, > when hemoglobin is 10g/dl, > 10 lbs. This is also known as the rule of 10’s.