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Headgears |
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Extraoral appliances are often an adjunct to braces treatment and are used by the orthodontists to move teeth or to control jaw growth in young patients. There are many types of extraoral "gears", and oposite to fixed appliance, cooperation is the key to succes.
There are many types of extra-oral appliances, but the most common are the:
· Cervical pull headgearl
· High pull headgear
· Chin cup
· Protractio headgear |
A cervical headgear is an orthodontic appliance used in the treatment of some orthodontic problems were there is a need to push maxillary tetth or bone backwards. It is typically used in growing patients to correct overbites by holding back the growth of the upper jaw, allowing the lower jaw to catch up. Headgear needs to be worn approximately 10-14 hrs to be effective in correcting the overbite, usually anywhere from 6 -18 months depending on the severity of the overbite and how much a patient is growing.
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| High pull headgears work the same way as the cervical pull, beeing the direction of the force applied backwards and upwards. In patients with vertical problems like open bites, it migh be a better choice than the cervical pull. |
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Chin cups, opposite to headgears pull, try to compensate excessive growh tendecy of the mandible by blocking it's growth. During this therapy the maxilla can growh freely to catch up excessive mandible growth |
Protraction headgear
A reverse pull headgear (protraction headgear) is designed to correct an under bite or a (Class 3) problem. An under bite is characterized by the lower jaw biting over the upper jaw.
Protraction headgear therapy is often restricted to growing patients only. Adult (non-growing) patients are often ineligible for this type of treatment. In the majority of cases, surgical intervention is often needed to help achieve an ideal result
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