Dental OSCE (Objective Structured Clinical Examination) Practice Exam

What dental condition might be represented by posterior teeth that appear prepared for crowns?

1. Amelogenesis imperfecta

2. Dentinogenesis imperfecta

3. Enamel hypoplasia

4. Oligodontia

The correct answer is: Amelogenesis imperfecta

The presence of posterior teeth that appear prepared for crowns is indicative of considerable morphological alterations often associated with conditions like amelogenesis imperfecta. This genetic disorder is characterized by defects in enamel formation that can lead to thin, defective, or absent enamel, making the teeth more susceptible to wear, decay, and sensitivity. As a result, during clinical examinations, these teeth can appear significantly worn down or prepared for crowns to provide structural support and protection, particularly if the enamel has been compromised to the point where restoration is necessary. In contrast, other conditions listed like dentinogenesis imperfecta, enamel hypoplasia, and oligodontia present with different clinical features. For example, dentinogenesis imperfecta primarily affects the dentin rather than the enamel, leading to discoloration and weakness of the teeth, but does not typically create a crown-prep appearance. Enamel hypoplasia results in enamel that is present but is underdeveloped or thin, possibly leading to some wear but not to the extent that would necessitate crown preparation immediately. Oligodontia involves the absence of multiple teeth and also does not relate to the appearance of teeth being prepared for crowns, as it deals with the number of teeth rather than their condition.