A patient with recent facial trauma is missing the crowns of both maxillary central incisors, and shows enamel hypoplasia of the lateral incisors and first molars. What is the most likely underlying cause of the hypoplasia (not the trauma itself)?

This is a recall question with some inherent ambiguity in differentiating diagnoses by history alone. Amelogenesis imperfecta is a hereditary enamel defect and is the documented answer for this recall; however, in a true clinical workup you would also consider whether the localized pattern (sparing other teeth) better fits regional odontodysplasia, or whether systemic exposure (tetracycline, high fever, fluorosis) better explains the timing — always correlate with family/medical history.