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  • Orthodontic appliances worn outside of the mouth that are used to apply force to the jaw and teeth. Orthodontic extraoral headgear can be classified as retraction headgear or protraction headgear, which are typically used to treat overjet (i.e., overbites) and underbites, respectively. Retraction headgear usually consists of a strap or straps that go around the neck (cervical pull) or the back of the head (high-pull), which connects to orthodontic appliances attached to the patient\'s teeth using a facebow. Protraction headgear (i.e., reverse-pull headgear or facemask) typically consists of a wire frame or straps that run down the length of the patient\'s face from a forehead pad and into a chin cup.
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