What is true about adhesive bonding in a total etch system?

In a total etch system, the bonding agent primarily consists of hydrophilic monomers, which is key to its function. These hydrophilic monomers are designed to penetrate the micro-etched surface of the enamel and dentin after they have been treated with phosphoric acid, which creates a rough, irregular surface that increases the effective surface area for bonding. The water content in the dentin can aid the hydrophilic monomers in forming a strong interface with the tooth structure, which is critical for achieving optimal adhesion.

Hydrophilic monomers facilitate the formation of a durable bond by allowing better wetting of the surfaces and supporting the design of a hybrid layer. This hybrid layer is formed through the infiltration of these monomers into the demineralized dentin, enhancing the bond strength to the substrate.

The other options either misrepresent the nature of the bonding agents or the requirements of the total etch system, which could lead to confusion about adhesive properties and their role in achieving effective dental bonding. Understanding the characteristics of the bonding agents in a total etch system is essential for proper application and maximizing adhesion in restorative dentistry.