There are no metal or elastic ties necessary with self-ligating braces as a built in "trap door" can be slid or flipped closed to engage the wire. This trap door holds the wire loosely in position, which reduces friction, but also allows less control of tooth movement.
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Self-ligating braces are similar to traditional orthodontic braces in their material make-up and have the same basic function. As with traditional metal braces, there are several variations of self-ligating braces. Self-ligating means that the bracket can basically tie itself to the arch wire.
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Self –Ligating Braces