When is a prime and bond agent placed on a tooth that will be restored with a glass ionomer liner and composite?

The placement of a prime and bond agent in the context of restoring a tooth with glass ionomer liner followed by a composite material is critical for ensuring proper adhesion and sealing of the restoration. The correct process involves etching the surface of the tooth, which is essential for creating micro-retentive patterns that enhance the bonding capability of subsequent materials.

After etching, a glass ionomer liner is applied. This helps protect the pulp and provides a strong base for the composite. However, to maximize the bond strength between the glass ionomer layer and the composite restoration, the prime and bond agent is applied after the glass ionomer has been placed. This agent serves to penetrate and enhance the bonding surface, facilitating a strong chemical and micromechanical bond when the composite is later applied.

Once the prime and bond agent is put on the glass ionomer, it is allowed to properly interact with the surface before the final layer of composite is applied. This methodology creates a robust and resilient bond that is crucial for the longevity of the dental restoration. By placing the prime and bond agent in this sequence, it ensures that both the glass ionomer and the composite can effectively adhere to the tooth structure, providing a seamless transition and minimizing the risk of failure at the margins