INBDE (Integrated National Board Dental Examination) Practice Exam

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80% of cleft lips are

Bilateral
Unilateral
Midline
Non-syndromic

The correct answer is: Unilateral

Cleft lips are a congenital anomaly where the upper lip does not form properly during fetal development. Bilateral means affecting both sides, so this option refers to Cleft lips that occur on both the left and right side at the same time, while Midline refers to cleft lips that occur at the center of the upper lip. Non-syndromic here means that the cleft lip is not associated with any other medical condition or syndrome. 80% of cleft lips are Unilateral, meaning they only occur on one side. Therefore, this option is correct as it accurately reflects the majority of cases.