The Morelli Nickel-Titanium Open Coil Spring is a nickel-titanium open coil supplied in 178 mm sticks, three to a pack. Seated on the archwire and compressed between two anchorage points, it releases a light and continuous force that opens space between the adjacent teeth over long activation intervals.
Key Features
Nickel-titanium construction — NiTi wound as an open-pitch coil
Works in compression — the coil pushes the adjacent teeth apart from the archwire
Light, continuous force — a light and continuous load applied across the segment being opened
Longer activation intervals — the coil keeps working through its range, extending the time between adjustments
178 mm sticks — three sticks per pack, each cut chairside to the inter-bracket span required
Cut at the closed spiral — cutting the stick at a closed spiral avoids leaving an open spiral tip on the segment
Technical Specifications
Material: NiTi (nickel-titanium)
Type: Open coil, compression
Length: 178 mm (7.0″) per stick
Quantity: 3 sticks
Purpose: Deliver light continuous compressive force to open space between teeth
Certifications: FDA Approved, CE Approved, ISO 9001:2015, ISO 13485:2016
Country of Manufacture: Brazil
Package Includes: 3 Morelli nickel-titanium open coil spring sticks, 178 mm (7.0″) each
Clinical Applications
Opening space between adjacent teeth — pushing the neighboring teeth apart to create room
Regaining space — recovering arch length lost to drifting
Space creation during leveling and alignment
Opening space with a nickel-titanium coil?
Cut the stick at a closed spiral, seat it in compression and let the NiTi run — a light, continuous force between appointments.