Herbst Appliance Mechanism — NDEB AFK MCQ
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Correct answer: C — Posturing the mandible forward continuously (24 hours/day) to stimulate mandibular growth and correct Class II malocclusion
The Herbst appliance is a fixed functional appliance (bonded to both arches) that maintains the mandible in a continuously protruded position 24 hours/day. This continuous mandibular advancement stimulates condylar growth (particularly effective during the pubertal growth spurt) and modifies the neuromuscular pattern. Unlike removable functional appliances (twin block), the Herbst does not depend on patient compliance for wear time. Typical treatment duration is 6-12 months.
Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019