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Orthodontic headgear is a type of orthodontic appliance attached to dental braces or a palatal expander that aids in correcting severe bite problems. == Need for treatment and concurrent corrections == Headgear is most commonly used to correct anteroposterior discrepancies. The headgear attaches to the braces via metal hooks or a facebow. Straps or a head cap anchor the headgear to the back of the head or neck. In some situations, both are used. Elastic bands are used to apply pressure to the bow or hooks. Its purpose is to slow or stop the upper jaw from growing, thereby preventing or correcting an overjet. Other forms of headgear treat reverse overjets, in which the top jaw is not forward enough. It is similar to a facemask, also attached to braces, and encourages forward growth of the upper jaw. Headgear can also be used to make more space for teeth to come in. In this instance the headgear is attached to the molars, via molar headgear bands and tubes, and helps to draw these molars backwards in the mouth, opening up space for the front teeth to be moved back using braces and bands. Multiple appliances and accessories are typically used along with the headgear, such as: power chains, coil springs, twin blocks, plates or retainers, facemasks, a headgear helmet (a headgear helmet is a cervical headgear with a cap that covers the entire head), lip bumpers, palate expanders, elastics, bionaters, Herbst appliances, Wilson appliances, other headgear, hybrid twinblocks, positioner retainers, and jasper jumpers. Many patients wear a combination of, or all of these appliances at any given time in their treatment. 〔Children and Orthodontics: Types of Braces, Retainers, Headgear and Facemasks www.webmd.com/oral-health/guide/children-and-orthodontics WebMD describes common types of orthodontics for children, including braces headgear, and retainers.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Orthodontic headgear」の詳細全文を読む スポンサード リンク
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