Dental OSCE (Objective Structured Clinical Examination) Practice Exam

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If a second molar is positioned below the plane of occlusion, what does this typically indicate?

Diastema
Hypertrophy
Angulated malocclusion
ANKYLOSIS

The correct answer is: ANKYLOSIS

When a second molar is positioned below the plane of occlusion, this typically indicates ankylosis. Ankylosis is a dental condition in which a tooth is fused to the bone and lacks the normal mobility one would expect. This fusion can occur due to various factors, including trauma or infection, and it prevents the tooth from properly erupting into the occlusal plane. As a result, the affected tooth, such as the second molar, remains below the occlusal plane, leading to misalignment with adjacent teeth and potentially affecting occlusion overall. In contrast, the other options relate to different dental conditions. Diastema refers to gaps between teeth, hypertrophy generally describes excessive growth, and angulated malocclusion addresses the misalignment of teeth, but these do not specifically explain the position of a tooth below the occlusion plane in the same context as ankylosis does.