What technique best describes correct rubber cup adaptation during polishing?

• A. Light pressure allowing the cup to flex slightly
• B. Heavy pressure to grind away stains
• C. Perpendicular contact with no flex
• D. Use of a hard brush

Answer: (A)

Adaptation of the rubber cup during polishing relies on light pressure that allows the cup to flex slightly and conform to the tooth surface. This gentle, yielding contact lets the polishing paste distribute evenly over curved contours, yielding a smooth finish without generating excess heat or removing too much enamel or dentin. Heavier pressure tends to grind material, increases heat, and can risk soft-tissue irritation. A contact that is perpendicular with no flex won’t follow the tooth’s contours and can cause uneven polishing or scratches. Using a hard brush isn’t appropriate for rubber cup polishing and won’t provide the needed adaptation.