SELF LIGATION www.speedsystem.com How does the SPEED Appliance control axial inclination? SPEED brackets are individually designed with a specific degree of built-in angulation to produce root positioning with the long axis of the root in a distal relationship to the crown. When second order (tip) control is required, SPEED’s Spring Clip is activated upon archwire engagement. The labial deflection of the Spring Clip remains until corrective tooth movement has occurred. Any subsequent deviation from this ideal is corrected through the reactivation of SPEED’s unique Spring Clip. The SPEED mechanism shown here has rotated itself clockwise to eliminate the gap (arrow) between the mesial end of its slot and the wire. Its Spring Clip works relentlessly to establish and maintain continuous contact between the entire mesio-distal length of its slot and the wire. During bodily translation, the retraction force will tend to dominate, causing tipping about a centre of rotation near the middle of the root. Such tipping results in a labial deflection of the SPEED Spring Clip. The energy stored by this elastic deflection of the spring is used later to upright the tooth once the retraction force ceases to dominate. 10
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