INBDE (Integrated National Board Dental Examination) Practice Exam

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Ace your INBDE with our comprehensive practice exam. Featuring detailed explanations, interactive flashcards, and a wide array of multiple-choice questions designed to mirror the real test. Get ready to surpass your expectations!

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What percentage of cleft lip cases also have a cleft palate?

The correct answer is: 70%

Cleft lip and cleft palate are two specific types of birth defects that can occur separately or together. Cleft lip occurs when the tissue that makes up the upper lip does not fully join together during fetal development, while cleft palate occurs when the roof of the mouth does not fully close. According to the Center for Disease Control and Prevention, cleft lip and cleft palate occur together in about 50% and 70% of cases, respectively. This means that approximately 70% of cleft lip cases also have a cleft palate, making option C the correct answer. Options A, B, and D are incorrect because they either underestimate or overestimate the percentage of cleft lip cases with a cleft palate.