Which factor can negatively affect the longevity of a dental sealant?

Inadequate light curing is a critical factor that can negatively affect the longevity of a dental sealant. Proper light curing is essential to ensure that the sealant material hardens and adheres effectively to the tooth surface. If the curing process is insufficient—either due to improper light exposure duration or incorrect use of the curing light—the sealant may remain soft or not bond correctly, leading to a higher likelihood of wear, dislodgment, or failure over time.

In contrast, other factors like using a high-viscosity material, applying too much etchant, or working in a dry field may have implications on the application methodology or effectiveness but do not directly impact the polymerization and stabilization of the sealant as inadequate light curing does. Light curing ensures that the chemical reactions necessary for the material to set fully occur, making it fundamental for the sealant's durability.