Smear layer is removed by

Smear layer is removed by

• A. Acid etching
• B. Water rinsing
• C. Heating
• D. Drying

Answer: (A)

Removing the smear layer relies on dissolving the debris layer that forms on dentin during preparation. Acid etching with phosphoric acid dissolves that smear layer and demineralizes the superficial dentin, creating micro-porosities and exposing dentinal tubules. This exposes a receptive surface for adhesive penetration, enabling formation of a strong resin-dentin bond through the hybrid layer. Rinsing with water alone may wash away some loose debris but doesn’t reliably remove the smear layer. Heating isn’t a mechanism to remove it, and drying can actually damage the dentin surface without eliminating the smear layer.

Removing the smear layer relies on dissolving the debris layer that forms on dentin during preparation. Acid etching with phosphoric acid dissolves that smear layer and demineralizes the superficial dentin, creating micro-porosities and exposing dentinal tubules. This exposes a receptive surface for adhesive penetration, enabling formation of a strong resin-dentin bond through the hybrid layer.

Rinsing with water alone may wash away some loose debris but doesn’t reliably remove the smear layer. Heating isn’t a mechanism to remove it, and drying can actually damage the dentin surface without eliminating the smear layer.