Final answer:
The wet resin technique is used under an amalgam restoration to prevent microleakage.
Step-by-step explanation:
The wet resin technique is used under an amalgam restoration in dentistry to prevent microleakage.
Microleakage refers to the passage of bacteria, fluids, and ions between the tooth and the restoration, which can lead to secondary caries and other complications. By using the wet resin technique, a layer of bonding resin is applied between the tooth structure and the amalgam, creating a seal that helps prevent microleakage.
Therefore, option a) To prevent microleakage is the correct answer to the question.