Active Appliances
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An active appliance is a device used to apply forces to the teeth to change the relationship of the teeth.
a.)Removable active appliances
* Expansion and Labial Segment Alignment Appliance (ELSAA)
b.) Fixed active appliances
* Pin and Tube Appliances
* Ribbon Arch Appliances
* Begg Lightwire Appliances
* Edgewise Appliances
* Pre-adjusted Edgwise Appliances
* Self-ligating Edgewise Appliances
* Bi Helix
* Tri Helix
* Quad Helix
* Rapid Maxillary Expansion Appliance (RPE)
(Source:Wikipedia)