Which factor is critical for the longevity of sealants?

Moisture control during the placement of sealants is crucial for their longevity because the presence of saliva or other moisture can interfere with the bonding process of the sealant material to the tooth surface. When moisture is present, it can prevent the sealant from adequately adhering to the enamel, leading to potential gaps and the failure of the sealant to protect the tooth from caries over time. Proper isolation of the tooth during application can be achieved using methods such as using cotton rolls, suction, or a rubber dam, which helps create a dry field for optimal adhesion.

While temperature during application can influence setting times and consistency, it plays a less significant role compared to moisture control. The type of tooth subjected to sealant can have varying implications for its application, but ultimately, it is the bonding mechanism that primarily determines success. Timing of application may also be relevant, especially for ensuring that the sealant is applied before any decay can start, but without effective moisture control, the quality and durability of the sealant will be compromised regardless of the timing.