INBDE (Integrated National Board Dental Examination) Practice Exam 2025 - Free Practice Questions and Study Guide

Question: 1 / 1180

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

50%

60%

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.

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80%

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