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Z-spring. The Z-spring is constructed in 0.5-mm stainless steel wire and generally used to move one or two teeth labially (Fig.
Keeping this in consideration, why Z spring is called double cantilever spring?
Z spring The 'z' spring is also called double cantilever spring . The spring consist of t shaped arm whose arm are embedded in acrylic. It is used for buccal movement of premolar and some canine . It is activated by pulling the free end of the t toward the intended direction of tooth movement.
In this manner, what is a labial bow used for?
An active labial bow produces both horizontal and vertical force vectors resulting in palatal/lingual tooth movement and extrusion of tooth. It is used for retraction of proclined incisors.
Coil springs are special springs that fit between brackets and over the archwire to push or pull teeth on the archwire. These are similar to elastic ligatures only very thick. They are used to make space between your back teeth so bands can be placed more easily.