Abstract
Miniscrews are used for providing anchorage in orthodontics and have become an integral part in the orthodontic treatment of severely protrusive patients for maximum retraction of anterior teeth after premolar extractions. Often the miniscrews are placed according to the availability of safe zone, interradicular clearance and type of mucosa. Sometime loosening and failure of miniscrew and reinsertion with change in site lead to asymmetry in positioning. This uneven positioning of miniscrew imposes unbalanced biomechanics in the same jaw. Force vectors of space closing auxiliary spring differs on both side and causes disturbance in occlusion or asymmetry in arch form. This article shows how ‘3D force vector indicator’ can be used to overcome the problems arise due to asymmetric retraction forces with miniscrew anchorage. This technique measures and specifies the correct location of implant head, i.e. 3D position of the posterior point of attachment for retraction auxiliary and its direction of vector with respect to the fixed appliance and the underlying dentition.
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