Magic Orthodontic NiTi Closed Coil Spring

10pcs Orthodontic Dental 12/9/6mm NiTi Closed Coil Springs w/eyelets 1.60mm USA

NiTi Closed Coil Spring is ideal for cuspid retraction and closing extraction space. 

The low force, long acting properties of the Nickel-Titanium Closed Coil makes for an ideal force application when sliding one cuspid along an archwire activated a small amount. 

Greater activation of the coils results in higher forces that can be applied to closing extraction spaces with sliding mechanics. 

A major advantage is the long "range of activation" of nickel-titanium, allowing for extended appointment intervals, typically 8 weeks between reactivation. 

Activation for 12mm NiTi Closed Coil: 

Step 1=+3mm

Step 2= +5mm 

Step 3= +9mm 

Step 4= +11mm (nearly 100% activation)

Activation for 9mm NiTi Closed Coil: 

Step 1= +2mm 

Step 2= +3mm 

Step 3= +6mm 

Step 4= +8mm (nearly 100% activation)

Activation for 6mm NiTi Closed Coil: 

Step 1 - +1mm 

Step 2 - +2mm 

Step 3 - +3mm 

Step 4 - +5mm (nearly 100% activation)

Activation of these coils has been standardized by the number of millimeters of activation to generate a specific force according to the manufacturers testing charts.

These activations have been divided by McGann into "4 steps" relating to the clinical job and for ease of use in the clinic; not only for the initial activation, but also for reactivation. 

Use the NiTi Force Marker for ease in determining correct activation.

Step 1 = Cuspid retraction on a round wire = 120 grams 

Step 2 = Cuspid retraction on a rectangular wire with 13/23 Li brackets = 150 grams 

Step 3 = Rectangular archwire passes through 2 posterior slots/tubes = 210 grams (eg: force applied 6-KH loop to close first bicuspid (4) extraction space. 

Step 4 = Sliding mechanics with 3 posterior teeth to push the 19x25ss archwire through the slots/tubes = 275 grams (eg. Force applied 7-KH loop to close first bicuspid extraction space)

12mm

Coil Length: 0.47"

Wire Size: .010" x .030"

Eyelet Diameter: .006"

9mm

Coil Length: 0.35"

Wire Size: .010" x .030"

Eyelet Diameter: .006"

6mm

Coil Length: 

Wire Size: .010 x .030

Eyelet Diameter: .006

10 springs per package