In a bonding process, what technique is used with composite resins?

The acid-etch technique is pivotal in the bonding process for composite resins. This method involves applying an acidic solution, commonly phosphoric acid, to the enamel and sometimes to the dentin surfaces of the tooth. The acid selectively demineralizes these surfaces, creating a roughened texture that enhances the mechanical retention of the composite resin.

When the enamel is etched, the process exposes the microscopic structure of the tooth, allowing for better infiltration of the bonding agent and ensuring a stronger bond between the tooth structure and the composite material. This technique is fundamental because it significantly increases the surface area for bonding and improves the wetting of the surface by the resin, which is crucial for a successful restoration.

Understanding that the acid-etch technique is integral to achieving effective adhesion with composite resins helps clarify why it is the correct answer in this context. The other techniques mentioned serve different purposes and do not specifically involve the process of bonding composite resins in the same effective manner as acid etching.