Australian Dental Council (ADC) Test 2025 – 400 Free Practice Questions to Pass the Exam

The application of a dentin bonding agent typically begins with acid etching the dentin surface. This step is crucial because acid etching creates a micro-roughened surface by removing the smear layer and demineralizing the top layer of the dentin. This process exposes the collagen fibers within the dentin and creates a more conducive surface for the bonding agent.

After etching, the bonding agent can be applied effectively, allowing for better infiltration into the dentin's microstructure. This enhances the overall bond strength between the adhesive materials and the tooth structure. Proper acid etching also helps to create an optimal environment for achieving a reliable and strong bond, which is essential for the longevity and durability of dental restorations.

In contrast, directly applying the bonding agent to dentin without etching (as described in one of the other options) may lead to inadequate bonding, as the agent would not penetrate into the modified surface effectively. The use of a chelating agent, while important in some specific situations related to endodontics or cleaning, is not the first step in the bonding process. Similarly, applying the bonding agent after drying dentin could compromise the bond if it prevents adequate penetration of the bonding agent into the dentine structure.