Which is true regarding the use of nano-filled bonding agents?

The assertion that nano-filled bonding agents usually cover the dentin in one application is accurate. These advanced materials possess small particle sizes that enhance their flow and adaptability to the irregular surface of dentin. The nano-fillers allow for a more uniform coverage, which is crucial for achieving a reliable bond.

One application can effectively create a strong interface between the bonding agent and dentin, largely because of the improved wettability and penetration capabilities of these nano-filled agents. This characteristic is particularly beneficial in clinical scenarios, where effective bonding can lead to better restoration longevity and reduced microleakage.

In contrast, the other options describe aspects that do not align with the known properties of nano-filled bonding agents. For instance, the ability of these agents to effectively penetrate dentin is one of their standout features, in contrast to the claim of poor penetration. Additionally, nano-filled bonding agents are designed to create a thinner film layer rather than a thicker one, allowing for more precise application and minimization of excess material. Lastly, the bonding capability to sclerotic dentin is enhanced with nano-filled materials rather than being poor, as their refined particle size improves interaction with such complex surfaces.