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The only force system that can produce pure rotation (a moment with no net force) is a couple, which is two equal and opposite and parallel forces, but non-collinear.
De-rotation of a tooth is necessary for:
Orthodontic leveling and alignment.
Prosthodontics and restorative purposes.
In cases of severe rotations (>90°) it is very difficult to bond attachments for proper application of couple forces due to inaccessibility to surfaces or size of attachments. In such cases, multiple repositioning of bonded attachments will be required during de-rotation of tooth.
This article describes a simple and economical technique to de-rotate a severely rotated tooth to create space for palatally impacted canine.
FABRICATION OF DOUBLE-LOOP DE-ROTATOR
It is made up of thick ligature wire (0.009˝). It is twisted around explorer to make loops at either end [Figure 2].
Steps in bonding of de-rotator
Separators were placed to get clearance for bonding [Figure 3].
Loop of de-rotator was bonded on labial and lingual surface of rotated tooth with routine bonding procedure [Figure 4].
Connector of de-rotator is contoured on the proximal surface.
Complete de-rotation of tooth shown in Figure 6.
Simple and economic technique.
No need of repositioning of attachments.
Like any other procedure involving bonding it is technique sensitive and proper moisture control is a must.
Undue heavy forces can lead to debonding of the attachment.
Source of Support:Nil.
Conflict of Interest:None declared.
- Am J Orthod.. 1984;85:294-307Mechanics of tooth movement.
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