Which finishing-stage archwire size is typically used to provide torque control?

Which finishing-stage archwire size is typically used to provide torque control?

• A. 0.014" NiTi.
• B. 0.019"×0.025" rectangular stainless steel.
• C. 0.021" round NiTi.
• D. 0.018"×0.025" SS.

Answer: (C)

Torque control comes from using a wire that fills the bracket slot in a rectangular shape, so it can generate a twisting moment about the tooth’s long axis. A rectangular archwire engages the slot and can resist tipping, allowing precise expression of tooth root torque during finishing. In contrast, a round wire lacks the slot engagement needed to produce controlled torque, so it’s not ideal for finishing torque control. For finishing-stage torque, a stiff rectangular wire is preferred because it maintains its shape and reliably applies the intended torque to the brackets. Among the options, the rectangular stainless steel wire is the type that provides this torque control, as opposed to the round NiTi wire which would primarily contribute to alignment with less torque expression.

Torque control comes from using a wire that fills the bracket slot in a rectangular shape, so it can generate a twisting moment about the tooth’s long axis. A rectangular archwire engages the slot and can resist tipping, allowing precise expression of tooth root torque during finishing. In contrast, a round wire lacks the slot engagement needed to produce controlled torque, so it’s not ideal for finishing torque control. For finishing-stage torque, a stiff rectangular wire is preferred because it maintains its shape and reliably applies the intended torque to the brackets. Among the options, the rectangular stainless steel wire is the type that provides this torque control, as opposed to the round NiTi wire which would primarily contribute to alignment with less torque expression.