Extension, or Closed Coil, springs are used to maintain or close spaces. Pg offers extension springs in popular lengths with pre-attached Key-end™ eyelets. Our Key-ends are attached firmly to the spring and are manufactured with smooth edges and round hole for easy attachment to TADs (Temporary Anchorage Devices), hooks, or brackets to retract teeth.

Pg offeres Nickel Titanium Extension Springs in both Variable and Superelastic forces. Variable Extension Springs, our most popular, provide gentle tooth-moving forces that gradually decrease during retraction. Superelastic Extension Springs provide near-constanttooth-moving forces throughout their activation range.

• Springs are made of premium Nickel Titanium wire.

• Provide continuous retraction forces throughout activation.

• Securely attached, precision designed Stainless Steel Key-end eyelets for easy attachment.

• Virtually no permanent deformation with proper use.

• Recommended activation length is two times original spring length.

Helpful Hint:

• The greater the wire size, the higher the force.

• The smaller the inside diameter (lumen), the higher the force.

• The shorter the length (# of active coils), the higher the force.

An economical offering, Stainless Steel springs provide high initial forces; however, unlike the forces of our premium Nickel Titanium spring, Stainless Steel forces decrease rapidly with tooth movement. Stainless Steel springs are also subject to taking a permanent set when fully compressed or expanded.

• Manufactured of 304V Stainless Steel

• Spooled 40 inch springs allow for convenient chairside sizing.

• Extension springs are effective in maintaining space openings.

• Compression springs are most commonly used to create space.