Comparison of Canine Retraction Using Ni-ti Closed-coil Springs Vs Elastomeric Power Chains During Orthodontic Treatment

Ni-Ti closed-coil spring is a passive compressed spring made up of super elastic Nickel-titanium. Two eyelets are attached to each side of the coil to facilitate its application. The eyelets will be engaged in the hooks of the second premolar and canine brackets and will apply a force of 150 gm.

Elastomeric power chains are resilient and latex-free orthodontic materials. They are made up of elastic material and consist of many connected rings. Each ring is engaged in a bracket to apply a force of 175-300 gm.