Rapid Correction Of Rotation With Modified Rotation Tie

“Tooth rotation, is defined as mesiolingual or distolingual intraalveolar displacement of the tooth around its longitudinal axis”.
Number of factors are involved in the rotation of teeth like space inadequacy, abnormal tooth eruption sequence, and undesirable forces exerted by the tongue and lips or any above combination. Biomechanical principles involve application of single or couple of force for correction of rotation. Rotated teeth can be corrected by removable, semifixed or fixed appliance depending upon the severity of rotation. Removable appliance containing z spring along with labial bow and semifixed (whip appliance) can treat mild rotations. Fixed appliance is a treatment of choice for severe rotations of teeth.

Correction Of Rotation With Modified Rotation Tie


Derotation can be done by number of ways with fixed appliances

1. By engaging NiTi archwire into bracket slot. Because of its superelastic nature and creating 1st order couple as it regains its original shape.
2. Offcentered brackets bring slight over correction of rotations. It exerts greater pull force on the side having maximum rotation. placement of offcentered bracket on rotated right central incisor.
3. Rotation wedge brings over correction by exerting push force. Figure 2 showing placement of elastic module on distal tie wing of mesiolabially rotated both lower lateral incisor and mesial tie wing of distolabially rotated lower left canine.
4. Palatal/lingual attachments helps in engaging force from lingual side, thus couple force can be applied (from labially/ buccally placed bracket and lingual attachments).
5. Ligature rotation tie onto the arch wire acts by applying a couple of force to bring derotation.It is stretched from one side of the tooth needing rotation across its lingual surface and passed interproximaly and finally hooked onto the wire. Elastic thread can also be used in the same way.

6. Rotation spring can also be used in Beggs technique. Read more.............

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