Match the order of bends: 1st order bends control facial/lingual inclination, 2nd order bends control angulation of bracket slots, 3rd order bends control torque in bracket slots.

• A. 1st order: facial/lingual inclination; 2nd order: angulation of bracket slots; 3rd order: torque in bracket slots
• B. 1st order: torque; 2nd order: facial; 3rd order: angulation
• C. 1st order: arch length; 2nd order: bracket thickness; 3rd order: color
• D. 1st order: root tipping; 2nd order: root rotation; 3rd order: bracket height

Answer: (A)

In orthodontic wire mechanics, three bend orders describe distinct tooth movements: tipping the crown, adjusting angulation, and creating torque. The first-order bends change the crown’s inclination in the facial/lingual direction, effectively tipping the crown toward the lips or tongue. The second-order bends influence the tooth’s angulation as reflected by the bracket slot orientation, which alters how the tooth sits in the arch. The third-order bends generate torque by twisting the wire within the bracket slot, producing root torque. This aligns with the statement that the first order controls facial/lingual inclination, the second order controls angulation of bracket slots, and the third order controls torque in bracket slots. Other options misassign these roles or bring in unrelated factors like arch length, color, or bracket height, which don’t describe how bend orders work.