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Twin Blocks

A Twin Block consists of an upper and lower plate. When the teeth are brought together, the lower jaw is forced forward into a more ideal position. The muscles act on the teeth and jaws via the plates to correct the bite.

This type of treatment is commonly referred to as a first phase treatment an aims to move the upper and lower teeth into a good position relative to one another and to encourage ideal growth of the jaws. It usually commences when there are still some first teeth present and there is active growth occurring. This growth allows the jaw growth to be directed and the teeth to move into a better position. The new permanent teeth are then more likely to erupt in the correct position.

The duration of this phase varies with the severity and nature of the problem, but is generally approximately 12-24 months. Co-operation, by wearing the appliance, is the most important factor. Good wear can reduce the treatment time and poor wear can result in no improvement whatsoever.

All orthodontic appliances are designed to apply gentle pressure to the teeth, which results in tooth movement. The wires and plastic apply the pressure to the teeth. The movements possible with plates are limited compared with full braces. They are good at moving many teeth but are not as good as braces at positioning individual teeth into an ideal position.

There may be a break between the two phases while the remainder of the permanent teeth erupt. During this time

it may be necessary to wear an appliance occasionally to maintain the correction that has been achieved.

Click here to watch our video introduction on a twin block appliance

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