For the early edgewise design, what feature provided rotational control?

For the early edgewise design, what feature provided rotational control?

• A. No mechanism for rotational control exists in early edgewise.
• B. Elastics attached to hooks on the bracket.
• C. Eyelets soldered on the corners of the band to permit ligature ties for rotational control.
• D. A separate rotational key is used.

Answer: (C)

Rotational control in the early edgewise design comes from how the ligature wires could engage the tooth via eyelets on the band. Eyelets soldered to the corners of the molar band let you thread and tie ligatures in a way that creates a bending moment around the tooth’s long axis. When the archwire and ligature are cinched through these eyelets, a controlled twist is applied to the tooth, producing rotation rather than simple tipping. That built‑in mechanism for generating a moment is what made rotation possible in the early edgewise system. Elastics on hooks mainly apply vertical or horizontal forces and don’t inherently produce the precise rotational moment needed. A separate rotational key isn’t part of the early edgewise design, and saying there’s no mechanism ignores how those eyelets provided the necessary rotational control.

Rotational control in the early edgewise design comes from how the ligature wires could engage the tooth via eyelets on the band. Eyelets soldered to the corners of the molar band let you thread and tie ligatures in a way that creates a bending moment around the tooth’s long axis. When the archwire and ligature are cinched through these eyelets, a controlled twist is applied to the tooth, producing rotation rather than simple tipping. That built‑in mechanism for generating a moment is what made rotation possible in the early edgewise system.

Elastics on hooks mainly apply vertical or horizontal forces and don’t inherently produce the precise rotational moment needed. A separate rotational key isn’t part of the early edgewise design, and saying there’s no mechanism ignores how those eyelets provided the necessary rotational control.