FMA and Facial Type — NDEB AFK MCQ

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ModerateOrthodonticsFMA and Facial TypeNDEB AFK

In a cephalometric tracing, an increased Frankfort-mandibular plane angle (FMA) indicates which facial type?

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Correct answer: D — Dolichofacial (long face)

An increased FMA (>30°, normal approximately 25° ± 5°) indicates a dolichofacial (long face, hyperdivergent) pattern characterised by increased lower anterior face height, steep mandibular plane, narrow alar base, and tendency toward anterior open bite. A decreased FMA (<20°) indicates a brachyfacial (short face, hypodivergent) pattern with deep bite tendency. FMA is measured between the Frankfort horizontal plane (Porion-Orbitale) and the mandibular plane (Gonion-Menton).

Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019