What procedure uses an acidic chemical to prepare enamel and dentin surfaces for bonding?

What procedure uses an acidic chemical to prepare enamel and dentin surfaces for bonding?

• A. Polishing
• B. Desensitizing
• C. Acid Etching
• D. Sandblasting

Answer: (C)

Preparing enamel and dentin for bonding relies on creating a receptive surface with an acid etchant. The acidic chemical, typically phosphoric acid, removes the smear layer and roughens the outer surface of enamel by demineralizing a thin layer. This creates microscopic pores that allow resin bonding agents to flow into and form strong micromechanical tags, increasing bond strength. On dentin, the acid not only removes the smear layer but partially demineralizes the surface to expose a collagen network, enabling the adhesive to infiltrate and form a hybrid layer that securely bonds the resin to the tooth. After etching, rinsing and proper drying are essential before applying the adhesive and composite. Other procedures don’t achieve this purpose: polishing smooths surfaces, desensitizing targets sensitivity rather than bonding, and sandblasting uses abrasive particles rather than an acidic chemical to create the necessary surface for bonding.

Preparing enamel and dentin for bonding relies on creating a receptive surface with an acid etchant. The acidic chemical, typically phosphoric acid, removes the smear layer and roughens the outer surface of enamel by demineralizing a thin layer. This creates microscopic pores that allow resin bonding agents to flow into and form strong micromechanical tags, increasing bond strength. On dentin, the acid not only removes the smear layer but partially demineralizes the surface to expose a collagen network, enabling the adhesive to infiltrate and form a hybrid layer that securely bonds the resin to the tooth. After etching, rinsing and proper drying are essential before applying the adhesive and composite.

Other procedures don’t achieve this purpose: polishing smooths surfaces, desensitizing targets sensitivity rather than bonding, and sandblasting uses abrasive particles rather than an acidic chemical to create the necessary surface for bonding.