Which of the following is described as a change in contemporary edgewise appliances?

• A. Elimination of ligature ties
• B. Automatic rotational control
• C. Increased archwire diameter
• D. Measurement units changed

Answer: (B)

Automatic rotational control is a feature of modern edgewise systems where the bracket design and archwire interaction guide tooth rotation without the clinician needing to bend wires or apply extra adjustments. In contemporary preadjusted brackets, the slot geometry and built‑in prescription align the crown as the wire seats, so rotations happen more predictably and efficiently. This means teeth rotate into their desired positions automatically as alignment progresses, reducing chair time and skill needed for manual torqueing. The other ideas describe changes that affect ligation style, wire stiffness, or reporting units, but they don’t capture the automatic guidance of rotation built into the bracket–wire interaction.