Associate Professor Department of Orthodontics, Sharad Pawar Dental College, Sawangi.
Online published on 9 November, 2012.
Miniscrews are used as anchorage in orthodontics and become the integral part in orthodontic treatment of severely protrusive patients for maximum retraction of anterior teeth after premolar extractions. The miniscrews are then placed according to the availability of safe zone, inter-radicular clearance, and type of mucosa. Sometimes loosening and failure of miniscrews and reinsertion with change in site lead to asymmetry in positioning. This uneven positioning of miniscrew imposes absent unbalanced biomechanics in same jaw. Force vector of space closing auxiliary spring differs on both sides and causes disturbance in occlusion or asymmetry in archform. This article shows how ‘3D Biomechanical Balance Indicator’ can be used to overcome the problems that 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.
Biomechanics, 3D Biomechanical Balance Indicator, En-masse Retraction, Miniscrew Anchorage, Retraction Force
