Rectangular arch‑wires are used in orthodontic treatment to exert controlled forces that move teeth. Compared with round arch‑wires (used early in treatment), rectangular wires engage more fully with bracket slots and allow refined control over tooth position and orientation

• Fits snugly into rectangular bracket slots → provides better control over tipping, rotation, and torque of teeth.

• High stiffness and rigidity → capable of delivering stronger, more stable forces (useful for root movement, space closure, and finishing stages).

• Enables movement in all three dimensions (vertical, bucco‑lingual, mesio‑distal) when properly bent and adjusted.

• Good for final alignment and detailing — bringing teeth into precise final positions once major alignment is achieved.

• Compatible with common arch‑wire materials (e.g. stainless steel, nickel‑titanium, beta‑titanium), allowing flexibility in choosing based on treatment needs.