What is a characteristic of a sedative base in dental procedures?

A sedative base in dental procedures is primarily characterized by its ability to alleviate pulp irritation, especially in cases where there has been decay or trauma to the tooth. This property is crucial for ensuring patient comfort and protecting the pulp tissue during and after treatment. Sedative bases often contain specific ingredients that promote healing and provide a soothing effect, which is essential when the pulp is sensitive or inflamed.

The other characteristics associated with dental materials, such as adhesion to enamel, thermal insulation, or exclusive use for permanent restorations, do not align with the primary purpose of a sedative base. While some materials might exhibit strong adhesion or thermal insulating properties, those are not defining features of sedative bases. Therefore, the correct choice reflects the primary function of sedative bases in reducing pulp irritation, which is vital for patient care during dental procedures.