Which dental liner is most effective at reducing microleakage according to the hydrodynamic theory?

The most effective dental liner at reducing microleakage according to the hydrodynamic theory is the dentine bond. This theory suggests that the movement of fluid within the dentinal tubules due to thermal or osmotic changes plays a significant role in the sensation of pain or discomfort, often referred to as pulpal sensitivity.

Dentine bonding agents create a strong adhesive interface between the dental restoration and the tooth structure. They work by sealing the microspaces and dentinal tubules, thereby minimizing pathways for fluid movement and significantly reducing microleakage. This sealing not only protects the dental pulp from potential irritants present in the oral environment but also maintains the integrity of the restoration over time.

Calcium hydroxide, while commonly used for its pulp-protective qualities, does not provide the same level of sealing capability as dentine bonding agents. Zinc oxide/eugenol is effective for its soothing properties but also lacks the strong adhesive qualities required to significantly reduce microleakage. Zinc phosphate, while historically used as a dental cement, does not offer the same bonding effectiveness to dentin as modern dentine bonding agents do, making it less effective in preventing microleakage. Thus, dentine bond agents stand out in their ability to effectively