The Morelli Stainless Steel Universal Form Rectangular Archwires are CrNi (nickel-chromium) archwires produced in a universal arch form for the working and finishing phases of fixed appliance therapy. A rectangular section fills the bracket slot in both dimensions, which is what allows the wire to express torque and control root position — something a round wire cannot do at any diameter.
Key Features
Slot engagement and torque expression — the rectangular section seats against the slot walls and transmits third-order control to the root.
High stiffness and tensile strength — CrNi provides the rigidity required for space closure, anchorage control and finishing.
Corrosion resistance — chromium forms a passive oxide layer that protects the wire in the oral environment.
Reduced friction — a polished surface keeps sliding mechanics predictable along the bracket slot.
Good formability — accepts stops, offsets and torque adjustments bent chairside.
Six dimensions, upper and lower separately — every dimension is available as a distinct upper archwire or lower archwire.
Technical Specifications
Material: Stainless Steel CrNi (Nickel-Chromium)
Arch Form: Universal
Section: Rectangular
Wire Sizes: .016″ × .016″ (0,40 × 0,40 mm), .016″ × .022″ (0,40 × 0,55 mm), .017″ × .025″ (0,43 × 0,63 mm), .018″ × .025″ (0,46 × 0,63 mm), .019″ × .025″ (0,48 × 0,63 mm), .021″ × .025″ (0,53 × 0,63 mm)
Arch Options: Upper or Lower, selected per unit
Purpose: Torque expression, space closure and finishing in the working and final phases of orthodontic treatment
Certifications: FDA Approved, CE Approved, ISO 9001:2015, ISO 13485:2016
Country of Manufacture: Brazil
Package Includes: 10 Morelli CrNi stainless steel rectangular archwires in the selected dimension (.016″ × .016″, .016″ × .022″, .017″ × .025″, .018″ × .025″, .019″ × .025″ or .021″ × .025″) and the selected arch (upper or lower)
Clinical Applications
Torque and root positioning once alignment and leveling have been completed with round wires.
Space closure and sliding mechanics, where wire rigidity preserves arch form under continuous force.
Finishing and detailing, where full slot engagement sets the final crown and root inclination.
Why choose Morelli stainless steel rectangular archwires?
Because torque is only expressed when the wire fills the slot. These archwires combine CrNi rigidity, corrosion resistance and low friction across six dimensions, each available as a separate upper or lower archwire.