Molar-Incisor Hypomineralisation — MFDS Part 1 MCQ
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Correct answer: D — Demarcated enamel opacities affecting at least one first permanent molar, with or without permanent incisor involvement
MIH is characterised by demarcated enamel opacities affecting at least one first permanent molar; permanent incisors may or may not be involved. Lesions vary from white or cream to yellow-brown and more severely affected enamel may undergo post-eruptive breakdown. MIH is a qualitative mineralisation defect, unlike hypoplasia, where enamel quantity or thickness is reduced. Option B describes the diffuse, symmetrical pattern associated with fluorosis. Option C suggests localised hypoplasia following trauma or infection of a primary predecessor. Option E describes hypomineralised second primary molars, a related condition but not MIH in the absence of first permanent molar involvement. Option A is more consistent with amelogenesis imperfecta.
Reference: Scottish Dental Clinical Effectiveness Programme (SDCEP), Prevention and Management of Dental Caries in Children, 'Caries and MIH', current online guidance. https://www.childcaries.sdcep.org.uk/guidance/assessment/clinical-assessment/assessing-carious-lesions/caries-and-mih/