What replaced soldered eyelets with ligature ties in the contemporary edgewise system?

• A. Elastics for rotational control
• B. Headgear attachments
• C. Twin brackets or extension wings
• D. Soldered eyelets

Answer: (C)

The key idea is how ligation and attachments evolved in the edgewise system. In older setups, brackets carried soldered eyelets specifically to anchor ligatures and elastics. Modern, contemporary edgewise brackets use twin brackets or extension wings around the slot, which provide built-in points for ligature ties and elastics without separate soldered eyelets. This design makes it easier to ligate the archwire, adjust, and change attachments, while preserving or improving control over tooth movement. The other options describe different components or uses (rotational elastics, extraoral headgear) or reiterate the older soldered eyelet method, which is not the replacement.