The Morelli Thermal Nickel Titanium Universal Form Archwires Rectangular are heat-activated NiTi archwires in Universal arch form with a rectangular cross-section. The alloy stays malleable and inactive while cold, and once it reaches the oral environment temperature it recovers its programmed shape, delivering constant orthodontic force with torque expression in the slot.
Key Features
Thermodynamic Activation — the microstructural transformation occurs above 27 °C (80.6 °F), so the wire only starts working after it is engaged in the mouth.
Easier Ligation When Cold — the archwire is malleable and inactive at room temperature, which simplifies engagement in severely displaced teeth.
Shape Memory — the wire returns to its programmed Universal arch form, generating continuous force for tooth movement.
Rectangular Cross-Section — fills the slot in both dimensions and adds torque control, unlike the round version of this archwire.
Six Working Sections — from .016″ × .016″ up to .021″ × .025″, covering the full progression to full slot engagement.
High Resistance — constant force delivery with resistance to permanent deformation between appointments.
Technical Specifications
Material: Heat-activated NiTi (Nickel Titanium)
Arch Form: Universal
Wire Cross-Section: Rectangular
Activation Temperature: Above 27 °C (80.6 °F) — oral environment temperature
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: Upper and Lower
Purpose: Orthodontic alignment, rotation and leveling with torque expression
Certifications: FDA Approved, CE Approved, ISO 9001:2015, ISO 13485:2016
Country of Manufacture: Brazil
Package Includes: 10 Morelli thermal NiTi Universal form rectangular archwires in the selected section and arch
Clinical Applications
Working phase after initial leveling, when rotation and torque must be resolved with light continuous force.
Severely displaced teeth that are difficult to ligate, where a cold, malleable wire allows engagement in one appointment.
Progression to full slot engagement, using the larger sections before finishing wires are placed.
Looking for constant force with easier ligation?
The rectangular thermal NiTi adds torque control to the heat-activated behavior of the round version.