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Space Closure in Edgewise Braces

Once space closure is needed after alignment, the remaining extraction space can be closed through anterior retraction, posterior protraction, or a combination. There are two approaches for space closure - using a continuous archwire where friction predicts tooth movement, or bending loops into the archwire which provides more precise anchorage but requires reactivation. Retraction mechanics can be divided into friction mechanics using sliding brackets or frictionless mechanics using loops or springs to move teeth without bracket sliding.

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sonal agarwal
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155 views2 pages

Space Closure in Edgewise Braces

Once space closure is needed after alignment, the remaining extraction space can be closed through anterior retraction, posterior protraction, or a combination. There are two approaches for space closure - using a continuous archwire where friction predicts tooth movement, or bending loops into the archwire which provides more precise anchorage but requires reactivation. Retraction mechanics can be divided into friction mechanics using sliding brackets or frictionless mechanics using loops or springs to move teeth without bracket sliding.

Uploaded by

sonal agarwal
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOC, PDF, TXT or read online on Scribd
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Preadjusted Edgewise Appliance

SPACE CLOSURE IN PREADJUSTED


EDGEWISE APPLIANCE

Once the alignment and leveling has been achieved, then the remaining extraction space
has to be closed according to the decision made during the treatment planning
considering the anchorage requirement either by,
 Anterior retraction
 Posterior protraction
 A combination of both

There are two basic force systems that can be used for space closure. With a continuous
arch wire, the friction between each individual bracket and wire is difficult to predict.
The second approach entails bending various types of loops into the arch wire. This
method is friction free and thus provides more precise anchorage control, but it carries
the problem of activation and reactivation of the closing loop. In frictionless mechanics
teeth are moved without brackets sliding along the arch wire. Retraction is accomplished
with loops or springs. The force of a frictionless retraction spring is applied by pulling the
distal end through the molar tube and cinching it back. The moment is determined by the
wire configuration and by the presence of pre activated gable bends, which produce an
activation moment. In general the more wire gingival to the bracket, the more favorable
the activation moment and therefore the better overall M/F ratio.

RETRACTION MECHANICS CAN BE BROADLY DIVIDED INTO


TWO CATEGORIES:
1. Friction mechanics ( Sliding mechanics )
2. Frictionless mechanics

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Preadjusted Edgewise Appliance

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