Any application of a force through an elastic induces and uses a certain combination of force and displacement, in
which the elastic deforms due to the pressure exerted and at the same time the force is liberated. This principle is
applied to all intraoral elastics that are used to co-assist in the orthodontic treatment. "z" elastics are an important
auxiliary that we use in orthodontic therapy to uncross a tooth or a group of teeth. The elastics are placed on the
palatine aspects of the upper teeth to be uncrossed to the buccal hooks of the lower teeth. The elastics must be 1/8"
in diameter. The effect and activation of these elastics are incremented by the mandibular movements.
We must bond direct adhesion buttons on the palatine aspects of the teeth that we want to uncross, and from
these buttons, place the "z" elastics stretching them to the buccal hooks of the lower teeth.
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