What do 1st order bends control?

What do 1st order bends control?

• A. Root tipping of teeth
• B. Vertical height of bracket
• C. Facial/lingual inclination of tooth
• D. There is no such bends

Answer: (C)

First-order bends change the tilt of the crown in the facial–lingual (buccolingual) direction. When you bend the archwire at the bracket slot in the buccolingual plane, you create a tipping moment that causes the crown to tilt toward the lips or toward the tongue, without moving the root. That’s why this type of bend governs the tooth’s facial/lingual inclination. By contrast, moving the root itself (torque) is controlled by second-order bends, not first-order, and the vertical height of the bracket isn’t altered by these bends.

First-order bends change the tilt of the crown in the facial–lingual (buccolingual) direction. When you bend the archwire at the bracket slot in the buccolingual plane, you create a tipping moment that causes the crown to tilt toward the lips or toward the tongue, without moving the root. That’s why this type of bend governs the tooth’s facial/lingual inclination. By contrast, moving the root itself (torque) is controlled by second-order bends, not first-order, and the vertical height of the bracket isn’t altered by these bends.