What is a primary characteristic of dentinal bonding agents?

The primary characteristic of dentinal bonding agents is to seal dentinal tubules to prevent microleakage. This is crucial in dental procedures because dentinal tubules, which are microscopic channels in the dentin of the tooth, can lead to sensitivity or decay if not properly sealed. By effectively creating a bond between the dental material (such as composite resin) and the dentin, these bonding agents help to provide a strong seal around restorations, minimizing the risk of bacteria entering the tooth structure and causing further issues. This sealing effect enhances the longevity and effectiveness of dental restorations, contributing to overall dental health and patient comfort.