INBDE (Integrated National Board Dental Examination) Practice Exam

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Which condition is associated with AD, missing clavicles, and supernumerary teeth?

  1. Osteogenesis Imperfecta

  2. Marfan Syndrome

  3. cleidocranial dysplasia

  4. Ehlers-Danlos Syndrome

The correct answer is: cleidocranial dysplasia

Cleidocranial dysplasia is the correct answer because it is the condition associated with missing clavicles (or partially malformed clavicles) and supernumerary teeth. Cleidocranial dysplasia is an autosomal dominant condition characterized by skeletal abnormalities including underdeveloped or absent clavicles, delayed closure of cranial sutures leading to a soft spot on the skull (fontanelle), and the presence of extra teeth (supernumerary teeth). Osteogenesis Imperfecta is a genetic disorder characterized by fragile bones that break easily (brittle bone disease) but it is not associated with missing clavicles or supernumerary teeth. Marfan Syndrome is a genetic disorder that affects the body's connective tissue, leading to long limbs, joint hypermobility, and aortic root dilation among other features. It is not associated with missing clavicles or supernumerary teeth. Ehlers-Danlos Syndrome is a group of genetic connective tissue disorders that affect the skin, joints, and blood vessels, causing hypermobility of joints and stretchy, fragile skin. It is not associated with missing clavicles or supernumerary teeth.