Headgear Function — NDEB AFK MCQ
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Correct answer: B — Headgear (cervical pull or high pull)
Headgear (face-bow attached to bands on the maxillary first molars connected to an extraoral force via a neck strap or head cap) is the classic growth modification appliance that restrains forward maxillary growth. Cervical-pull headgear also distally tips/moves maxillary molars and has a slight extrusive effect. High-pull headgear provides an intrusive vector and restrains vertical maxillary growth. It requires 12-14 hours/day of wear and significant patient compliance. Twin block appliances posture the mandible forward (different mechanism).
Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019